If it takes 7.2 pounds of seed to plant one acre of grass, how many acres can be planted with 8.4 pounds of seed?

1 1/6 of an acre

Step-by-step explanation:

You should set up a ratio (pounds of seed over number of acres)

So 7.2/1 = 8.4/?

Then solve for?

8.4 : 7.2 = 1 1/6

1 1/6 * 1 = 1 1/6

1 1/6 acres can be planted