Delhi Police Constable Exam Model Paper 8

Let their present age be measured in terms of x.
The ratio of the present ages of Leela and her mother is 3 : 8
So, present age of Leela is 3x and that of her mother is 8x.
The mother was 25 years old when Leela was born.
According to problem:
$8\mathit{x}\mathit{–}3\mathit{x}=25$
⇒ $5\mathit{x}=25$
⇒ $\mathit{x}=5$
So, the mother’s present age (in years) = 8x = (8 × 5) = 40 years.
Hence, ‘40’ is the correct answer.