Question

Solve the following.

If 8 oxen can plough 45 acres of land in 15 days, then how many acres of land can 12 oxen plough in 9 days?

Answer 1

Let 12 oxen plough x acres of land in 9 days.

If the number of acres of land increase, then the required number of oxen increases.

This is direct proportion.

If the number of acres increase, then the number of days will also increase.

This is also a direct proportion.

The detailed proportions are:

Oxen	Days	Acres
8	15	45
12	9	x

Thus, 12 oxen can plough of land in 9 days.