Question

If it takes 3 mechanics, 20 hours to build a car, how long will it take 4 mechanics?

Answer 1

Answer:

15 hours

Step-by-step explanation:

this is indirect proportion

3 mechanics take 20 hours

for 1 person it will take more

1 person will be 20×3 = 60 hours

4 people will be 60/4 hours = 15

hope it helps

Answer 2

Answer:

If 3 mechanics built a car in hours = 20

4 mechanics = 20 × 3 / 4 = 15 hours

Hope it help you !!