12 ounces of fertilizer for every 10 pounds.
How many pounds of fertilizer will the farmer need to make a mix that contains 120 pounds of soil?
120 ÷ 10 = 12
12 × 12 = 144
When 12 ounces of fertilizer for every 10 pounds, when 120 pounds, you will need 144 ounces of fertilizer.
Convert from ounces to pound:
1 ounce = 0.0625 pounds
0.0625 ×144 = 9
144 ounces = 9 pounds
The farmer will need 9 pounds (144 ounces) of fertilizer to mix 120 pounds of soil.