After $7 y e a r s$ Sarosh's father age will be $3 t i m e s$ that of Sarosh's present age which will simultaneously be equal to $6 t i m e s$ of Sarosh's present age. Sum of their present ages is equal to:
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Solution

Let Sarosh's present age be $x$ .
After $7 y e a r s$ Sarosh's age will be $x + 7$
and, his father's age will be $3 (x + 7)$ .
This is equal to $6 t i m e s$ Sarosh's present age, i.e. $= 6 x$
So,
$6 x = 3 (x + 7) = 3 x + 21$
$6 x - 3 x = 21$
$3 x = 21$
$x = 7$
Sarosh's present age is $7$ years.

Father's age after $7$ years is,
$6 \times 7 = 42 y e a r s$
His present age is,
$42 - 7 = 35 y e a r s$

$Sum of their present ages = 35 + 7 = 42$

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