Ten years ago, Kumar was thrice as old as Sailesh was but 10 years hence, he will be only twice as old. Find Kumar’s present age ?
Answer: B
Let Kumar’s present age be "\(x\)" years and Sailesh’s present age be "\(y\)" years.
Then, according to the first condition,
\(x - 10 = 3(y - 10) => x - 3y = - 20 ........(1)\)
Now, Kumar’s age after 10 years = \((x + 10)\) years.
Sailesh’s age after 10 years = \((y + 10)\) years.
\((x + 10) = 2 (y + 10) => x - 2y = 10 ......(2)\)
Solving (1) and (2),
we get \(x\) = 70 and \(y\) = 30
Kumar’s present age = 70 years and Sailesh’s present age = 30 years.