Answers

2014-12-09T21:19:27+05:30
Let the age of Sushil be x
and 
Let the age of Sunil be y

1)
 x = 4y -----------------------------------(1)

2)
x - 5 =  7(y - 5)-------------------------(2)

Putting the value of x in (2)

4y - 5 = 7y - 35
-3y = - 30
y = -30 / -3

y = 10

Putting the value of y in (1)
x = 40.

Hence the present age of Sushil is 40 yrs

And Sunil = 10 yrs

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2014-12-09T22:17:30+05:30
let Sunil 's present age be x
     Sushil's age 4x
% years ago Sunil age  =x-5
                     Sushils age=4x-5
As per question  7(x-5)=4x-5
                         ⇒ 7x-35=4x-5
                         ⇒3x=30
                         ⇒ x=10
     Sunil's age 10 and Sushil's age 40
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