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December 20, 2014

December 20, 2014

Posted by **Adam** on Friday, August 15, 2014 at 8:52am.

A. 40

B. 20

C. 10

D. 5

- math -
**Reiny**, Friday, August 15, 2014 at 8:58amI usually start with the smallest quantity, which here is Carl's age

let Carl's age be x

then Bill is 2x

and Al is 4x

in 10 years:

Carl --- x+10

Bill --- 2x+10

Al ---- 4x + 10

so 4x+10 = 2(x+10)

4x + 10 = 2x + 20

2x = 10

x = 5

So now Al is 4(5) = 20

check:

present ages:

Carl -- 5

Bill --- 10

Al ---- 20

10 years from now:

Al will be 30 and Carl will be 15

Is Al twice as old as Carl ?? YES

- math -
**Adam**, Friday, August 15, 2014 at 9:05amthanks

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