Mathematics MCQs

Page No. 72

Two pipes P and Q can fill a cistern in 12 minutes and 16 minutes respectively. Simultaneously both the pipes are opened together, then after how much time Q should be closed so that the tank is full in 9 min ?


a2 min

✖


b3 min

✖


c4 min

✓


d5 min

✖


View Answer 4 min

P, Q and R can complete a work in 24, 6 and 12 days respectively. The work will be completed in________days if all of them are working together.


a2

✖


b3 3⁄7

✓


c4 ¼

✖


d5

✖


View Answer 3 3⁄7

A work can be finished in 16 days by twenty women. The same work can be finished in fifteen days by sixteen men. The ratio between the capacity of a man and a woman is_________?


a1:3

✖


b4:3

✓


c2:3

✖


d2:1

✖


View Answer 4:3

If 10 bulls can plough 20 identical fields in 3 days working 10 hours a day, then in how many days can 30 bulls plough 32 same identical fields working 8 hours a day?


a2

✓


b8

✖


c10

✖


d12

✖


View Answer 2

A can lay a railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in_________?


a4

✖


b9.6

✓


c9

✖


d10

✖


View Answer 9.6

Twelve men can do a work in twenty days while twenty women can finish the same work in sixteen days. Find the ratio between the capacity of a man and a woman.


a3:4

✖


b5:4

✖


c4:3

✓


d5:3

✖


View Answer 4:3

A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. A alone can do the work in__________?


a20 days

✖


b30 days

✓


c40 days

✖


dnone of these

✖


View Answer 30 days

A tap can fill a tank in 32 min. and another can empty it in 16 min. If the tank is already half full and both the tanks are opened together, the tank will be_________?


a12 min

✖


b14 min

✖


c16 min

✓


d20 min

✖


View Answer 16 min

A leak in the bottom of a tank can empty the full tank in 6 hrs. An inlet pipe fills water at the rate of 4 lit. a minute. When the tank is full, the inlet is opened and due to the leak, the tank is empty in 8 hrs. The capacity of the tank in liters is_________?


a5,750 litres

✖


b5,760 litres

✓


c6,890 litres

✖


dNone of these

✖


View Answer 5,760 litres

10 men can complete a work in 7 days. But 10 women need 14 days to complete the same work. How many days will 5 men and 10 women need to complete the work?


a30 days

✖


b25 days

✓


c20 days

✖


d15 days

✖


View Answer 25 days

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