S.chand Class 8 Maths Solution Chapter 10 Variation and Direct and Inverse Proportions Exercise 10 C

 Exercise 10 C

Question 1

1. 4 men can make 4 cupboards in 4 days; how many cupboards can 14 men make in 14 days?

2. In a hostel it costs $₹ 1800$ to keep 50 children for 8 weeks. For what length of time did the cost of keeping 90 children amount to $₹ 21060$ ?

3. In how many days of working 8 hours each day, can 12 men do the same work as 10 men working 9 hours a day do in 16 days ?

4. If 10 men, working 7 hours a day dig a trench $147 \mathrm{~m}$ long, how many men working 8 hours a day will dig a trench $168 \mathrm{~m}$ long (of the same breadth and depth as the first in the same number of days) ?

5. Three pumps working 8 hours a day can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day ?

6. If a man travels $65 \mathrm{~km}$ in 3 days by walking $7 \frac{1}{2}$ hours a day, in how many days will he travel $156 \mathrm{~km}$ by walking 8 hours a day ?