SOLUTION: Mary who is 54 years of age and has a niece named Abbie who is 18 years old. In how many years will Abbie's age be 2/5 of Mary's age?

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Question 1107633: Mary who is 54 years of age and has a niece named Abbie who is 18 years old. In how many years will Abbie's age be 2/5 of Mary's age?
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
Mary is 54
and
Abbie is 18

x, number of years until Abbie is (2/5)Mary.

18%2Bx=%282%2F5%29%2854%2Bx%29
-
90%2B5x=2%2854%2Bx%29
90%2B5x=108%2B2x
3x=108-90
3x=18
highlight%28x=6%29