Final answer:
Leslie should buy 3 pounds of rocks for the scout troop's planting project, which can be calculated by multiplying 3/5 pounds per member by the 5 members in the troop.
Step-by-step explanation:
Leslie needs to calculate the total amount of rocks required for the planting project by multiplying the amount needed per troop member by the number of members in the troop. Each member needs 3/5 pounds of rocks, and there are 5 members in the troop.
To find the total amount of rocks Leslie should buy, we perform the following calculation:
Amount of rocks per member = 3/5 pounds
Total members = 5
Total amount of rocks = 3/5 pounds × 5 members
After multiplying, we get:
Total amount of rocks = 3/5 × 5 = 3 pounds (C)
Therefore, Leslie should buy 3 pounds of rocks for the scout troop's planting project.