Question

5. 15 men can build a wall in 42 hours, how many workers will be required for the same work in 30 hours?
6. 6 pumps working together empty a tank in 28 minutes. How long will it take to empty the tank if 4 such pumps are working together?
7. In a PG House, the food provision for 20 persons is for 10 days. How long would the food provision last if there were 5 more persons in that PG house? ​

Answer 1

Answer:

5. 15 mens = 42 hours

? mens = 30 hours

15×42 = 30×?

21 mens build a wall in 30 hours....