Question

8 students take 18 hours to construct a raft.

If the raft needs to be completed 12 hours earlier, calculate how many more students are needed.

Answer 1

16

Explanation:

Students 8 x

Time taken (hours) 18 18 - 12 = 6

If number of students increases, the work will completed in less hours.

So inverse proportion

`x =(18*8)/(6)=3*8 = 24`

Additional students required = 24 - 8 = 16