Question

Find the age of Virat if the age of his grandfather is 5 less than the cube of his age and his grandfather's age is 59.

• A. 3
• B. 4
• C. 5
• D. 6

Answer 1

The correct option is B 4

Let the age of Virat be $x$.
Given: The age of his grandfather is 5 less than the cube of his age i.e. $x^3-5$.
Also, the age of his grandfather is 59.

$\therefore x^3-5=59\Rightarrow x^3=64\Rightarrow x^3=4^3\Rightarrow x=4$

Therefore, Virat is 4 years old.