If 2/3 ton of gravel covers 3/4 of a driveway, how many tons of gravel are required to cover the entire driveway?

Oh come on! Look at this:

If 2/3 ton of gravel covers 3/4 of a driveway, you need to divide 2/3 divided by 3 to find how much is needed for 1/4 of the driveway. So first step:

1. 2/3 divided by 3 = 2/3 * 1/3. So 2/9.

2. Add 2/3 plus 2/9 = 8/9 ton of gravel to cover the whole driveway.