Find the present age

Algebra Level 1

Marvin's age is 2 5 \dfrac{2}{5} of his age 18 18 years from now. Find the present age of Marvin.


The answer is 12.

A Former Brilliant Member by A Former Brilliant Member

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2 solutions

Let m m be Marvin's present age. Then

m = 2 5 ( m + 18 ) m = \dfrac{2}{5}(m+18)

5 m = 2 m + 36 5m = 2m + 36

3 m = 36 3m = 36

m = 12 m = 12

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The question,"What was his age five years ago?"

X X - 3 years, 2 months ago

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Thanks. I've edited the problem for clarity.

A Former Brilliant Member - 3 years, 2 months ago

18 is 3/5 so, his age now is 18/3*2=12.

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