Old guys arguin over math from long ago

So we have ave a math problem that we are arguing on. This started as an argument between two 40 year olds looking through kid's math books. Here is the problem:

If there is 26 times more caffeine in a normal cup of coffee than in decaf and the total between them is 121.5 Grams of caffiene, how much is in each cup?

While I have no clue how to solve it, I can verify answers (Thank god my old brain retains that :) ). My logic says that:

Decaf + Regular = 121.5

Decaf * 26 = Normal

He is trying to tell me that Decaf = 4.67 and Caffien = 116.82. Rounded of course.

I can tell this is wrong because while Decaf + Regular is true, Decaf * 26 is not.

How can I prove him wrong here?

:)

Thanks!

Re: Old guys arguin over math from long ago

Quote:

Originally Posted by

**CorySCline** So we have ave a math problem that we are arguing on. This started as an argument between two 40 year olds looking through kid's math books. Here is the problem:

If there is 26 times more caffeine in a normal cup of coffee than in decaf and the total between them is 121.5 Grams of caffiene, how much is in each cup?

While I have no clue how to solve it, I can verify answers (Thank god my old brain retains that :) ). My logic says that:

Decaf + Regular = 121.5

Decaf * 26 = Normal

He is trying to tell me that Decaf = 4.67 and Caffien = 116.82. Rounded of course.

I can tell this is wrong because while Decaf + Regular is true, Decaf * 26 is not.

How can I prove him wrong here?

:)

Thanks!

Maybe the fact that, like you said, Decaf x 26 is wrong...

Re: Old guys arguin over math from long ago

Yes. However, he is dense. He does not understand my logic. How do i solve the problem properly to show him the correct answer?

Re: Old guys arguin over math from long ago

Quote:

Originally Posted by

**CorySCline** Yes. However, he is dense. He does not understand my logic. How do i solve the problem properly to show him the correct answer?

Assuming that you are using the words "normal" and "regular" for the same thing...

So with this working, and showing him that the numbers work in both equations, you should be able to convince him...

Re: Old guys arguin over math from long ago

Awesome :)...He gets it now lol.. Thanks for your time :)