Question

The directions for mixing an insect spray say to use 2 7/8 ounces of chemical in each gallon of water. How many ounces of chemical should be mixed with 3 2/3 gallons of​ water? First, estimate the answer to the application problem. Then find the exact answer.

Answer 1

Estimate :
2 7/8 ounces ≈ 3 ounces
3 2/3 ounces ≈ 4 ounces

1 gallon needs about 3 ounces of chemical
4 gallons needs about 3 x 4 = 12 ounces of chemical

------

Actual:

1 gallon = 2 7/8 ounces of chemical
3 2/3 gallon = 2 7/8 x 3 2/3 ounces of chemical.
[Assuming you can use the calculator to compute]
3 2/3 gallon = 10 13/24 ounces of chemical.