A supply room has enough couplings to last a crew of 30 electricians for 120 days and enough connectors for 75 days. How many days would this supply of couplings last a crew of 90 electricians

Answer 1

3 times the people, so it will last 1/3 as long

Answer 2

Thanks
I got 40 as the answer

Answer 3

How did you get 40