An algebra problem by Jia Quan Ng

Algebra Level 2

Joan is 6 years old. When Joan is at her dad's age, her dad is 64 years old. What is her dad's age now?


The answer is 35.

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Jia Quan Ng by Jia Quan Ng , 21, Malaysia

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3 solutions

Let dads age be x. So x-6 = 64 - x , 2 x = 70 , x = 35

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Sunil Pradhan
Oct 23, 2014

Let dad's age be x and after y years she will be of dads age x

so 6 + y = x i.e. x – y = 6

after y years dad will be x + y years = 64

using x + y = 64 and x – y = 6 olve x = 35

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Jia Quan Ng
Oct 5, 2014

6+(64-6)/2=6+58/2=6+29=35

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