SOLUTION: Martha is 2/3 of sarahs age,their combined age is 15, how old is each girl

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Question 358324: Martha is 2/3 of sarahs age,their combined age is 15, how old is each girl
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

Let x be Sarah's age.  Then Martha's age is (2/3)x

x+%2B+%282%2F3%29x+=+15

3x + 2x = 45

5x = 45

x = 9

Sarah is 9 and Martha is 6

checking our answer

9 + 6 = 15