Question

find 50 rational number lying between 1/5 and 1/4

Answer 1

$\frac{1}{5} = \frac{400}{2000}$
and
$\frac{1}{4} = \frac{500}{2000}$
now between 400 and 500 there exists 100 rational number so
50 rational number =
$\frac{401}{2000} \frac{402}{2000} \frac{403}{2000} ................ \frac{450}{2000}$
hope it helps