SOLUTION: Matt is twice as old as his daughter Sally. Ten years ago, the sum of their ages was 31. How old is each person now?

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Question 987185: Matt is twice as old as his daughter Sally. Ten years ago, the sum of their ages was 31. How old is each person now?
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
Hi there,
Matt is twice as old as his daughter Sally.
M = 2S
Ten years ago, the sum of their ages was 31.
M - 10 + S - 10 = 31
Replace M with 2S from top equation
2S - 10 + S - 10 = 31
Collect like terms
3S = 31 + 20
3S = 51
S = 17
Matt is 34 years old
Sally is 17 years old
Hope this helps :-)