Question

Sita can cut 8 onion in 10 minutes and jyoti cut 6 onion in 5 min how much time they together take to cut 24 onion

Answer 1

Sita can cut 8 onion in 10 min
so in 1 min Sita can cut $\frac{8}{10}$
in the same way Jyoti can cut $\frac{6}{5}$

now in 1 min together they can cut
$( \frac{8}{10} + \frac{6}{5} ) = 2$
so, 2 onion in 1 min
24 onion in 12 min
so together they take 12 min to cut 24 onion.