Question

out of 50 seats in a bus,40percent are occupied by the passengers. how many seats were vacant?

Answer 1

30 seats were vacant ........hope it will help you

Answer 2

$vacant \: seats = 100 - 40 \\ = 60percent \\ \frac{60}{100} \times 50 = 30 \\ so \: 30 \: seats \: were \: vacant$
I hope my answer help you.