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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?

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16 years

20 years

22 years

25 years

answer is B.

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Detailed Solution

Concept- To get the answer of this question we assume the ishika age and then we will make the equation and after making and solving the equation we will get the age of ishika.
Let’s take that age of ishika is

years.
Then the age of grandpa is

years.
So the equation will be formed after this is
Question Image

As we got that age if ishika is

. And that is for grandpa is

Hence, the correct option is 3.

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