Chain Rule Questions and Answers

A contractor undertook to do a certain piece of work 9 days. He employed certain number of men, but 6 of them being absent from the very first day, the restcould finish the work in 15 days. the number of men originally employed were :

A contractor undertakes to do a piece of wok in 40 days. He engages 100 men at the beginning and 100 more after 35 days and completes the  work in stipulated time. If he had not engaged the additional men, how many days behind schedule would it be finished ?

2 men and 7 boys can do a piece of work in 14 days; 3 men and 8 boys can do the same in 11 days. Then 8 men and 6 boys can do three times the amount of this work in :

A wheel rotates 10 times every minute and moves 20 cm during each rotation. How many cms does the wheel move in 1 hour ?

 3 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?

If the cost of x metres of wire is d rupees, then what is the cost of y metres of wire at the same rate?

Running at the same constant rate, 6 identical machines can produce a total of 270 bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes?

39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?

 If a quarter kg of potato costs 60 paise, how many paise will 200 gm cost?

In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk?