Question

5. A bridge can be constructed by 1800 workers in
50 days. How many more such workers should be
employed to complete the work in 30 days?
6. Thirty-five cows can clear a field by grazing in 15
days. How many cows will graze the same field in
7 days?
7. 21 pumps can empty a water tank in 36 hours.
How many hours would 56 pumps take to do the
same work?​

Answer 1

120 more workers are needed to build the bridge in 30 days.

75 cows can grace the field in 7 days.

6 hours and 45 minutes would be required to drain off the pump.

Hope it helps you.

Answer 2

Answer:

5. 1800×50=30×X

X=3000 wokers

6.35×15=7×X

X=75 cows

7.21×36=56×X

X=13.5 hours