Question

Ishika and her grandfather both had birthdays last week. The sum of their ages is $100$ years. Her grandfather's age is $4$ times Ishika's age. How old is Ishika?

• A. $16$ years
• B. $20$ years
• C. $22$ years
• D. $25$ years

Answer 1

Answer: (B)

$20$ years

Let Ishika's age be $x$

Then grandfather's age would be $4x$.

Also, it is given that

$4x+x=100$

$\Rightarrow 5x=100$

$\Rightarrow x=20$

Therefore, age of Ishika is $20$ years.