Haryana Police Constable Model Paper 6

Given:
Age ratio of Rina and Babita (5 years before) $=1:2$
Ratio of their present age $=7:9$
Calculations:
Let the present ages of Rina and Babita be $7\mathrm{x}$ and $9\mathrm{x}$
So, the ratio of their ages 5 years ago:
$\left(7\mathrm{x}-5\right):\left(9\mathrm{x}-5\right)=1:2$
$\Rightarrow 14\mathrm{x}-10=9\mathrm{x}-5$
$\Rightarrow \mathrm{x}=1$
∴ The present age of Babita is 9 × 1 = 9 years