Answer:
number of ounces in the third box = 32 ounces
Step-by-step explanation:
The number of ounces is directly proportional to the cost
Let O represent the number of ounces, C represent the cost
O∝C----------------Eqn 1
O = KC
K = O÷C = 20/5 = 4
Hence number of ounces in the third box = 4 × 8 = 32 ounces