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Question

Ishaan is 2 times as old as Christopher. 35 years ago, lshaan was 7 times as old as Christopher. How old is Christopher now?


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Solution

Formulate the linear expression to solve the unknown variable:

Let the present age of Christopher be x.

Since Ishaan is twice as Christopher,

Ishaan=2x

Now, 35 years ago,

The age of Christopher was x-35.

and the age of Ishaan was 2x-35.

According to the question,

7(x-35)=2x-357x-245=2x-357x-2x=-35+2455x=210x=2105x=42

Therefore, the age of Ishaan is,

2×42=84

Hence, the age of Christopher is 42.


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