Mathematics MCQs

Page No. 71

To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is:__________?


a 5 min


b10 min


c15 min


d20 min


View Answer 5 min

A cistern has two taps which fill it in 12 min. and 15 min.respectively There is one outlet pipe in the cistern. When all the taps & pipe are opened, the empty cistern is full in 20 min. How long will the waste pipe (outlet) take to empty the full cistern ?


a10 min


b20 min


c30 min


d40 min


View Answer 10 min

6 men and 8 women can complete a work in 10 days. 26 men and 48 women can finish the same work in 2 days. 15 men and 20 women can do the same work in_______days.


a4 days


b6 days


c2 days


d8 days


View Answer 4 days

P is 30% more efficient than Q. P can complete a work in 23 days. If P and Q work together, how much time will it take to complete the same work?


a9


b11


c23


d13


View Answer 13

P works twice as fast as Q. If Q alone can complete a work in 12 days, P and Q can finish the work in________days


a1


b2


c3


d4


View Answer 4

If 6 men working together can complete 50 identical tasks in 4 hours then how many such identical tasks can be completed if 10 men are working together for 6 hours?


a20


b25


c125


d60


View Answer 125

A,B,C, can do a work in 8,14,16 days respectively. A does the work for the first 2 days. B continues from it and finishes 2/3rd of the remaining work. C finishes the remaining work. How many days would have taken to complete the work?


a13


b11


c12


d15


View Answer 13

A and B can do a piece of work in 21 and 24 days respectively.They start the work together and after some days, A leaves and B completes the rest of the task in 9 days. After how many days did A leave?


a5


b6


c7


d8


View Answer 7

A can do piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?


a70 days


b120/7 days


c50 days


d45 days


View Answer 120/7 days

A can do a certain job in 12 days. B is 60% more efficient than A. The number of days it takes for B to do the same piece of work, is:_________?


a12/6 days


b15/2 days


c23 days


d34 days


View Answer 15/2 days

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