In 10 years, Bob will be twice as old as he was 7 years ago. How old is he now?
Maths? Isn't math?
Both are widely-used forms. It's usually "math" in the U.S. and "maths" over in the U.K. and Europe.
I learned something new today! Thanks @eddieringle
you learned english instead math here? :)
Answer by Ivan Tomica
Aug 12, 2011 at 05:07 PM
24, cause 10+7= 17 17x2=34 34-10=24. my opinion :)
just check if 24 is right answer ;)
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
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)
x+10 = 2x-14
24 = 2x - x = x
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