Answer:
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 .