Subtraction fact that has the same difference as 16-9

You are cycling around europe with friends. you book into a hostel and you ask the owner what the ratio of men to women is currently staying there. there are 24 men and 6 women. what is the ratio of men to women in its simplest form?

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?