Final answer:
To finish planting 32 trees, given that 11 are already planted and the group can plant 3 trees per hour, it will take 7 more hours.
Step-by-step explanation:
The student is presented with a word problem that involves calculating a specific quantity. The environmental group has already planted 11 trees and wants to plant a total of 32 trees. They can plant 3 trees per hour. To find out how long it will take to finish planting the remaining trees, we first need to calculate how many trees are left to plant by subtracting the number of trees already planted from the total desired number of trees.
Total trees to be planted – trees already planted = trees left to plant
32 – 11 = 21 trees left to plant
Next, since the group can plant 3 trees per hour, we divide the trees left to plant by the rate of planting to find the time needed to finish the task.
Trees left to plant / rate of planting = time to finish
21 trees / 3 trees per hour = 7 hours
Therefore, the group will need 7 more hours to finish planting the remaining trees.