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In 10 years, Bob will be twice as old as he was 7 years ago. How old is he now?

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Both are widely-used forms. It's usually "math" in the U.S. and "maths" over in the U.K. and Europe.

Best Answer

**Answer** by Ivan Tomica
·
Aug 12, 2011 at 05:07 PM

24, cause 10+7= 17 17x2=34 34-10=24. my opinion :)

Mattophobia

eddieringle

eddieringle

But 'In 10 years' would mean to add 10, and '7 years ago' would mean subtraction, correct?

yes , put it this way. if he have 24 before 7 years he had 17 , and for 10 years he will have 34 and that is double than he had 7 years ago (17)

You are correct!

2(24 - 7 = 17) = (24 + 10)

x = 24

;) i know i am. in highschool (that was last year)i was sooooo bad in math, and now, i rock ;)

**Answer** by wrileys
·
Aug 12, 2011 at 05:16 PM

x+10=2x-7 So x, bob, must be 17

Mattophobia

Close, but the question states that he will be "twice as old as he was 7 years ago." Therefore, the equation looks like:

x+10 = 2(x-7)

Distributing: x+10 = 2x-14

Simplify: 24 = 2x - x = x

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