A tailor takes twice as much time to make 3 dresses, as he would need to make 5 shirts.

Question

If he takes 90 hours altogether to make 9 dresses and 15 shirts, how long does he take to make each shirt?

Answer 1

If 90 hours are needed for 9 dresses and 15 shirts,

Then 30 hours are needed for 3 dresses and 5 shirts.    (divide by 3)

The dresses take twice as much time, so that is 20 hours.  (20 for dresses, 10 for shirts)

20 hours for 3 dresses mean each dress takes 6 hours and twenty minutes (20 / 3)