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Question
After 20 years, Manoj will be 5 times as old as he is now. Find his present age.
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Solution
Let the present age of Manoj be x yr.
Then, Manoj’s age after 20 yr = (x + 20) yr
It is given that after 20 yr, Manoj's age will be 5 times his present age
Therefore, the equation is x + 20 = 5x
⇒ 20 = 5x – x ...[Transposing x to RHS]
⇒ `20/4 = (4x)/4` ...[Dividing both sides by 4]
⇒ 5 = x
Hence, the present age of Manoj is 5yr.
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