Exercise 10.4
1. Rice costing ₹480 is needed for 8 members for 20 days. What is the cost of rice required for 12 members for 15 days?
Solution:
Cost of rice per member per day = ₹
Cost of rice for 12 members for 15 days =
2. 10 men can lay a road of 75 km long in 5 days. In how many days can 15 men lay a road of 45 km long?
Solution:
Work done per man per day =
Number of days 15 men can lay a 45 km road =
3. 24 men working at 8 hours per day can do a piece of work in 15 days. In how many days can 20 men working at 9 hours per day can complete the same work?
Solution:
Total work in man-hours =
Number of days 20 men working 9 hours/day can complete the same work =
4. 175 men can dig a canal 3150 m long in 36 days. How many men are required to dig a canal 3900 m long in 24 days?
Solution:
Work done per man per day =
Number of men required to dig a 3900 m canal in 24 days =
5. 14 typists typing 6 hours a day can take 12 days to complete the manuscript of a book. How many days will 4 typists, working 7 hours a day, can take to do the same job?
Solution:
Total work in typist-hours =
Number of days 4 typists working 7 hours/day will take =