Final answer:
To calculate the number of marbles in the jar, you divide the total weight of the jar, 3/5 of a pound, by the weight of one marble, which is 0.04 pound. The result is 15 marbles in the jar.
Step-by-step explanation:
The question asks to calculate the number of marbles in a jar, given the weight of the jar and the individual weight of each marble. We are told that each marble weighs 0.04 pound and the total weight of the jar is 3/5 of a pound. To find the number of marbles, we divide the total weight of the jar by the weight of a single marble.
The calculation is as follows:
Determine the total weight of the marbles: Since the total weight of the jar is 3/5 (or 0.6) pounds and knowing that each marble weighs 0.04 pound, we first convert 3/5 of a pound to the common unit of pounds.
Divide the total weight by the weight of one marble: 0.6 pounds ÷ 0.04 pounds/marble = 15 marbles. So, there are 15 marbles in the jar.