Verbal Reasoning - Arithmetic Reasoning - Discussion

Discussion :: Arithmetic Reasoning - Section 1 (Q.No.22)

22. 

A father is now three times as old as his son. Five years back, he was four times as old as his son. The age of the son (in years) is

[A]. 12
[B]. 15
[C]. 18
[D]. 20

Answer: Option B

Explanation:

Let son's age be x years. Then, father's age = (3x) years.

Five years ago, father's age = (3x - 5) years and son's age = (x - 5) years.

So, 3x - 5 = 4 (x - 5) 3x - 5 = 4x - 20 x = 15.


Devonte Booker said: (Feb 5, 2013)  
The Father Is (Now) (3) Times Old As His Son, (5) Years Back He Was (4) Times Old As His Son.

I Just Multiplied 5*3= 15.

Tanuja said: (Dec 18, 2020)  
Please, someone, explain this properly.

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