Question

The ages of Jash and Jainam are in the ratio 7 : 9 . Four years from 0now the ratio of their ages will be 4 : 5. Find their present ages.

Answer 1

$\frac{7x + 4}{9x + 4} = \frac{4}{5} \\ 35x + 20 = 36x + 16 \\ x = 4 \\ 7 \times 4 + 4 = 32 \\ 9 \times 4 + 4 = 40$