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#4557527 - 02/24/21 01:29 PM Math - what is the correct answer?  
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There was only 16 squadrons of RAF fighters that used 100 octane during the BoB.
The Fw190A could not fly with the outer cannon removed.
There was no Fw190A-8s flying with the JGs in 1945.
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#4557528 - 02/24/21 01:38 PM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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Parenthesis / Multiplication-Division / Add-Subtract / left to right so 60 / 5 first then 12 * 2 = 24


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#4557529 - 02/24/21 02:03 PM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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I was never a "math person" when I went to school. I hated the subject. biggrin


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#4557531 - 02/24/21 02:42 PM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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I agree with Spidey on the order of operations.


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#4557543 - 02/24/21 04:24 PM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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Both of my above-average Casio calculators (fx-115ES PLUS and fx-9750GII) gave the answer of 6.

On a related note...

I wonder why they allow you to use a graphing calculator (like my fx-9750GII) for college entrance exams. Seems like cheating to me as it can solve almost every math problem they give you, even giving you a natural (notebook) display (think fractions and radicals). At most you may have to do some pre-input factoring or isolation of a specific variable, or make the equation equal to zero before entering, but even some free-style input is usually accepted. This is way more than just built-in trig tables.

Also, Windows 10 has a slick graphing calculator.



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#4557546 - 02/24/21 04:33 PM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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6. Did not need to watch the video. Just saw the preview image. Did not use a calculator. Calculator should not be permitted in school until High School for high math. I see kids using calculator starting in kindergarten. That will not help them in life.

#4557550 - 02/24/21 05:00 PM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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NFB, I worked it out correctly in my head as well, factoring vs. subtracting within the parenthesis, the only way I know it's done. The problem shows the fault of some calculators, including Windows 10 Scientific.



The rusty wire that holds the cork that keeps the anger in
Gives way and suddenly it’s day again
The sun is in the east
Even though the day is done
Two suns in the sunset, hmph
Could be the human race is run
#4557552 - 02/24/21 05:01 PM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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The calculator does not know math theory. It just does operations as you instruct it. The mathematically correct answer is 24


Archie Smythe

carpe diem
#4557553 - 02/24/21 05:04 PM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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Oops, maybe I didn't work it correctly (6). Must come back to this.



The rusty wire that holds the cork that keeps the anger in
Gives way and suddenly it’s day again
The sun is in the east
Even though the day is done
Two suns in the sunset, hmph
Could be the human race is run
#4557556 - 02/24/21 05:10 PM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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Is it? Maybe, but what if you replace 5(7-5) by 5C, where C=(7-5)

Would you still multiply the whole by C, or treat 5C as the divisor.

If an explicit multiplication sign were shown between A/B and (C) then I would certainly treat it as being 24... with the implicit multiplication ~ it becomes ambiguous and could represent a physical situation where you have A/(BC) or one where you have AC/B, and an answer of 6 or 24 according to the meaning behind the badly written equation....

I would want to know what the application was and what resulted in that form, to be sure I was applying the order of operations not just "correctly" but appropriately and correctly, as there are competing

#4557560 - 02/24/21 05:26 PM Re: Math - what is the correct answer? [Re: Lieste]  
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Originally Posted by Lieste
Is it? Maybe, but what if you replace 5(7-5) by 5C, where C=(7-5)


Yes, I have a "math background" (through/including graduate school - "A"s) and I got "6".

Why? 60+5(7-5) is not the same as 60+5x(7-5). With the "x" missing before the (), the 5(7-5) is treated as a computational group -- as like you say 5C where C is (7-5).

My calculator agrees: By the calculator 60+5x(7-5) = 24 ; whereas, by the calculator 60+5(7-5) = 6.

But, at a minimum, the video shows that some folks see it differently -- so, one needs to be careful that they are not misunderstood.


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#4557564 - 02/24/21 05:42 PM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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12 x 2 = 24


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#4557577 - 02/24/21 06:56 PM Re: Math - what is the correct answer? [Re: NoFlyBoy]  
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Originally Posted by NoFlyBoy
6. Did not need to watch the video. Just saw the preview image. Did not use a calculator. Calculator should not be permitted in school until High School for high math. I see kids using calculator starting in kindergarten. That will not help them in life.

Watch the video.


There was only 16 squadrons of RAF fighters that used 100 octane during the BoB.
The Fw190A could not fly with the outer cannon removed.
There was no Fw190A-8s flying with the JGs in 1945.
#4557616 - 02/25/21 01:23 AM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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OK. So the part I don't get is that, if you follow PEMDAS, you do 7-5 first, so that's 2. But multiplication comes before division, so shouldn't you multiply the 5x2 next, and divide 60 by 10?

Maybe I should watch the video...

edit - Oh, I see now. Multiplication/Division are left to right...

Last edited by malibu43; 02/25/21 01:25 AM.

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#4557618 - 02/25/21 01:45 AM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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I need my old Texas Instruments calculator for this one. Back in the day, it was way cooler than a slide rule.


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#4558145 - 03/01/21 03:20 AM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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Here's Dell tech supports answer:

"It must be cultural!"


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#4558163 - 03/01/21 09:25 AM Re: Math - what is the correct answer? [Re: KraziKanuK]  
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I quote...


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It won't do you a bit of good to review Math
It's so simple
So very simple
That only a child can do it!


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#4558241 - 03/01/21 07:52 PM Re: Math - what is the correct answer? [Re: malibu43]  
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Originally Posted by malibu43
OK. So the part I don't get is that, if you follow PEMDAS, you do 7-5 first, so that's 2. But multiplication comes before division, so shouldn't you multiply the 5x2 next, and divide 60 by 10?

Maybe I should watch the video...

edit - Oh, I see now. Multiplication/Division are left to right...


Multiplication and Division is same priority. Not multiplication before division. Its left to right.


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#4558242 - 03/01/21 07:53 PM Re: Math - what is the correct answer? [Re: Allen]  
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Originally Posted by Allen
Originally Posted by Lieste
Is it? Maybe, but what if you replace 5(7-5) by 5C, where C=(7-5)


Yes, I have a "math background" (through/including graduate school - "A"s) and I got "6".

Why? 60+5(7-5) is not the same as 60+5x(7-5). With the "x" missing before the (), the 5(7-5) is treated as a computational group -- as like you say 5C where C is (7-5).

My calculator agrees: By the calculator 60+5x(7-5) = 24 ; whereas, by the calculator 60+5(7-5) = 6.

But, at a minimum, the video shows that some folks see it differently -- so, one needs to be careful that they are not misunderstood.



You don't group 5(7-5)....you can only group what is within the parenthesis. Only if you write (5(7-5))


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#4559641 - 03/12/21 07:45 PM Re: Math - what is the correct answer? [Re: Spidey]  
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Originally Posted by Spidey
Originally Posted by Allen
Originally Posted by Lieste
Is it? Maybe, but what if you replace 5(7-5) by 5C, where C=(7-5)


Yes, I have a "math background" (through/including graduate school - "A"s) and I got "6".

Why? 60+5(7-5) is not the same as 60+5x(7-5). With the "x" missing before the (), the 5(7-5) is treated as a computational group -- as like you say 5C where C is (7-5).

My calculator agrees: By the calculator 60+5x(7-5) = 24 ; whereas, by the calculator 60+5(7-5) = 6.

But, at a minimum, the video shows that some folks see it differently -- so, one needs to be careful that they are not misunderstood.



You don't group 5(7-5)....you can only group what is within the parenthesis. Only if you write (5(7-5))


I came back to this while looking through a spreadsheet and I trust Allen, the former NASA engineer.

When I did this last month I also came up with 6, and I do math for a living. To me, the 5 grouped with the parenthesis gives precedence over the divisor operand, thus you do the 5 * (result of 7-5) before you do the division of 60.

You are correct, however, in saying the double parentheses would make this clearer. I disagree with the youtube video.


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