Chain Rule Worksheet-4

Chain Rule Worksheet-4

1. If 9 examiners can examine a certain number of answer books in 12 days, working 5 hours a day; for how many hours a day would 4 examiners have to work in order to examine twice the number of answer books in 30 days?

(a) 6                    (b) 8                    (c) 9                    (d) 10

2. 20 men complete one-third of a piece of work in 20 days. How many more men should be employed to finish the rest of the work in 25 more days?

(a) 10                  (b) 12                  (c) 15                   (d) 20

3. If 18 binders bind 900 books in 10 days, how many binders will be required to bind 660 books in 12 days?

(a) 22                  (b) 14                  (c) 13                  (d) 11

4. If of a cistern is filled in 1 minute, how much more time will be required to fill the rest of it?

(a) 30 sec           (b) 40 sec          (c) 36 sec           (d) 24 sec

5. If x men, working x hours per day, can do x units of work in x days, then y men, working y hours per day would be able to complete how many units of work in y days?

(a)                 (b)                 (c)                 (d)

6. A rope makes 70 rounds of the circumference of a cylinder whose radius of the base is 14 cm. How many times can it go round a cylinder with radius 20 cm?

(a) 40                 (b) 49                 (c) 100                (d) None of these

7. If 5 engines consume 6 metric tonnes of coal when each is running 9 hours a day, how many metric tonnes of coal will be needed for 8 engines, each running 10 hours a day, it being given that 3 engines of the former type consume as much as 4 engines of the latter type?

(a)                 (b) 8                    (c)                 (d)

8. If a certain number of workmen can do a piece of work in 25 hours, in how many hours will another set of an equal number of men, do a piece of work, twice as great, supposing that 2 men of the first set can do as much work in an hour, as 3 men of the second set do in an hour?

(a) 60                 (b) 75                  (c) 90                  (d) 105

9. Some persons can do a piece of work in 12 days. Two times the number of such persons will a half of that work in:

(a) 6 days           (b) 4 days          (c) 3 days           (d) 12 days

10. A certain number of men can finish a piece of work in 100 days. If, there were 10 men less, it would take 10 days more for the work to be finished. How many men were there originally?

(a) 75                  (b) 82                 (c) 100                (d) 110

Answer Key:

(1)-c; (2)-b; (3)-d; (4)-b; (5)-d; (6)-b; (7)-b; (8)-b; (9)-c; (10)-d