Question

rakesh is half of his father's age now. ten years before he was 20 years younger to his father . what is their present age

Answer 1

Let father's age be x yrs and Rakesh's age be x/2 yrs 
Ten years before Rakesh's age = (x/2 - 10)
and father's age = ( x - 10 )
now according to the problem 
x/2 - 10 = (x-10)-20
x/2 -10 -x +10+20 = 0
x/2 - x +20 = 0
x-2x+40=0
-x = -40
x = 40 
∴The father is 40 yrs old and Rakesh is 20 yrs old
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Hope this helps.

Answer 2

Answer:

Step-by-step explanation:Let father's age be x yrs and Rakesh's age be x/2 yrs 

Ten years before Rakesh's age = (x/2 - 10)

and father's age = ( x - 10 )

now according to the problem 

x/2 - 10 = (x-10)-20

x/2 -10 -x +10+20 = 0

x/2 - x +20 = 0

x-2x+40=0

-x = -40

x = 40 

∴The father is 40 yrs old and Rakesh is 20 yrr