A framer plants three times as many acres of corn as wheat on his land. If he plants no more than 28 acres, what is the greatest number of acres that can be used for wheat?

The greatest number of acres used for wheat = 7 acres.

Step-by-step explanation:

The maximum number of land used by farmer to plant = 28 acres.

Let the land used to plant wheat = x.

So the land to plant trees will be = 3x.

Now,

x + 3x = 28 acres.

4x = 28 acres.

x = 7 acres

∴ Hence the greatest number of acres used for wheat = 7 acres.