1)

The ratio of vimal’s age and amala’s age is in the ratio 3 : 5 and their sum of their age is 80 years .The ratio of their ages after 10 years will be

A) 2 : 3

B) 1 : 3

C) 3 : 5

D) 2 : 5

E) 4 : 5

Let their ages be $3x$ and $5x$ respectively, Given $3x + 5x = 8x = 80$
$x = 10$
Ratio of their ages after 10 years $= \frac{3x + 10}{5x + 10}$
$=\frac{40}{60}$ $=2:3$