Q. 74.5( 22 Votes )
After 15 years, Mary’s age will be four times of her present age. Find her present age.
Let Mary’s present age be x years.
Her age after 15 years = (x + 15) years.
According to the given condition,
4x = x + 15
⇒ 4x – x = 15 (Transposing x to LHS)
3x = 15
⇒ x = (Transposing 3 to RHS)
x = 5
∴ Mary’s present age is 5 years.
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