Easy Age Problem: 1.2

Algebra Level 1

Elmer is 36 years old and his daughter is 8 years old. In how many years will Elmer's age be twice his daughter's age?


The answer is 20.

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Rhiana Vanessa Bag-id Amoin by Rhiana Vanessa Bag-id Am… , 25

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5 solutions

David Bass
Jun 26, 2014

This solution method works with any problem similar to this. When Elmer's daughter was born, Elmer was 28. So that means that 28 years from Elmer's daughter's birth, Elmer will be 56 and Elmer's daughter will be 28. 56-36=20, so the answer is 20.

7 Helpful 0 Interesting 0 Brilliant 0 Confused

Good job! :D :D :D

Finn Hulse - 6 years, 11 months ago

36 + x = 2(8 + x). Then x = 20.

3 Helpful 0 Interesting 0 Brilliant 0 Confused

Thanks was not getting the formulation .... :-)

Sunny Bhattacharjee - 6 years, 11 months ago
Raafat Mouhareb
Aug 11, 2015

36+x=y and 8+x=1/2y so 8+x=(36+x)/2 16+2x=36+x so x=20

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Kabir Bagai
Jul 19, 2014

36x=2(8x) 36x=16x 20x=1 x=20

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Filly Mare
Jun 25, 2014

Difference in age is 28 so the the daugher will be 28 when Elmer is twice her age. So in 20 years time.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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