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December 21, 2014

December 21, 2014

Posted by **Anjanique** on Tuesday, February 8, 2011 at 8:46am.

Billy is twice as ld as Sally was when billy was as old as Sally is now. And the total ages is 28 how old are they?

- Math -
**drwls**, Tuesday, February 8, 2011 at 9:08amLet Sally's age be S.

S = 12 + (S/2)

S/2 = 12

S = 24

=============================

(new question; different age for Sally, S)

Let Billy's age(now) be B; Sally's age (now) = S. Billy is older by B-S years

B + S = 28

B = 2*[S - (B-S)] = 4S -2B

3B -4S = 0

4B + 4S = 112

7B = 112

B = 16

S = 12

When Billy was 12, Sally was 8; he is 16 now. It checks

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