Question

6 students can plant a garden in 5 hours. How many additional students should they get to help if they need to finish the job in 3 hours instead of 5 hours?

Answer 1

4 students

Explanation:

3 hours · x students = 6 hours · 5 students

3x = 30

(divide by 3 on both sides of the equation)

x = 10

10 students needed in total to finish in 3 hours

10 - 6 (the students already there) = 4

4 more students needed

Answer 2

4 students needed

Explanation:

We can divide 5/6 and then round it to the nearest tenth which is 0.8.

This means every 0.8 hours 1 student is completed with their work.

We can then divide 3 hours with the 0.8 hours to get 3.75 students additionally needed to cut the time to 3 hours.

Obviously, we can't have 3/4's of a student so we convert that into 1 student, ending up with 4 students additionally needed to complete the work in 3 hours.

Mathematical work:

5 students/6 hours

= 0.8 hours

0.8 hour/3 hours

=3.75 students

Round 3.75 to 4

4 students additionally needed.

Hope this helped.