Age relation...

Algebra Level 1

The average age of a man and his son is 20 years. After 10 years the age of father becomes thrice that of his son. What is the present age of his son.


The answer is 5.

Rajaswa Patil by Rajaswa Patil , 22, India

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1 solution

Krishna Ramesh
Apr 23, 2014

Let the father's age be x and the son's age be y

So, x+y/2=20

or x+y=40.........................(I)

also, x+10=3(y+10)

That gives us , x-3y=20......................(ii)

Solving these 2 equations we get y=5

1 Helpful 0 Interesting 0 Brilliant 0 Confused

I can't understand how u formed these equations. .?

Mohammed Mohideen A - 7 years, 1 month ago

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Average of the ages of the father and the son is given by (x+y)/2=20, where x and y are mensioned above. After 10 yrs, father's and the son's age would be x+10 and y+10 respectively, So three times the age of the son (after 10 yrs): 3(y+10) is equal father's age (after 10 yrs) : x+10.

Vishnu Pillai - 7 years, 1 month ago

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