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IBPS RRB Test 721
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IBPS RRB Test 721
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  • Question 1/10
    1 / -0.25

    Directions For Questions

    Direction: Read the following information and answer the following given questions.

    Set X has 10 pipes which can fill 70% of a tank in 7 minutes. Set Y has 5 pipes which can fills 3/8 of the tank in 3 minutes. Set Z has 8 pipes which can empty 5/10 of the tank in 10 minutes.

    ...view full instructions

    If all the 23 pipes are opened at the same time then how many minutes will it take to fill the tank?

    Solutions

    Set X can fill 10% in a minute.

    Hence, every Pipe of set X can do 1% work per minute.

    Set Y has a filling capacity of 12.5% per minute (or 2.5% per minute for each tap in set Y).

    Set Z has a capacity of emptying the tank at the rate of 5% per minute and each tap of set Z can empty at the rate of 0.625% per minute.

    If all the 23 pipes are opened the per minute rate will be:

    10 + 12.5 – 5 = 17.5%

    Time required to fill the the tank =  =  minutes

  • Question 2/10
    1 / -0.25

    Directions For Questions

    Direction: Read the following information and answer the following given questions.

    Set X has 10 pipes which can fill 70% of a tank in 7 minutes. Set Y has 5 pipes which can fills 3/8 of the tank in 3 minutes. Set Z has 8 pipes which can empty 5/10 of the tank in 10 minutes.

    ...view full instructions

    If half pipes of set X are closed and all the pipes of set Y are open but pipes of set X and Y are working at half of their efficiency and all other pipes are also open, how long will it take to fill 49% of the tank?
    Solutions

    Set X will do 5% work per minute

    Set Y will do 6.25% work per minute,

    while set Z will do 5% work per minute (negative work).

    Hence, Net work will be 6.25% work per minute.

    To fill 49% it will take slightly less than eight minutes and the value will be a fraction. None of the first four options matches this requirement.

  • Question 3/10
    1 / -0.25

    Directions For Questions

    Direction: Read the following information and answer the following given questions.

    Set X has 10 pipes which can fill 70% of a tank in 7 minutes. Set Y has 5 pipes which can fills 3/8 of the tank in 3 minutes. Set Z has 8 pipes which can empty 5/10 of the tank in 10 minutes.

    ...view full instructions

    If 4 pipes are closed in set Z, and all others remain open, how long will it take to fill the tank?
    Solutions

    If 4 of the taps of set Z are closed, the net work done by Set Z would be –2.5% while the work done by Sets X and Y would remain 10% and 12.5% respectively. Thus, the total work per minute would be 20% and hence the tank would take 5 minutes to fill up.

  • Question 4/10
    1 / -0.25

    Directions For Questions

    Direction: Read the following information and answer the following given questions.

    Set X has 10 pipes which can fill 70% of a tank in 7 minutes. Set Y has 5 pipes which can fills 3/8 of the tank in 3 minutes. Set Z has 8 pipes which can empty 5/10 of the tank in 10 minutes.

    ...view full instructions

    If the tank is half full and set X and set Y are closed, how many minutes will it take for set Z to empty the tank if alternate taps of set Z are closed?
    Solutions

    Again if we close 4 taps of set Z, the rate of emptying by set Z would be 2.5% per minute. A half filled tank would contain 50% of the capacity and hence would take 50/2.5

    = 20 minutes to empty.

  • Question 5/10
    1 / -0.25

    Directions For Questions

    Direction: Read the following information and answer the following given questions.

    Set X has 10 pipes which can fill 70% of a tank in 7 minutes. Set Y has 5 pipes which can fills 3/8 of the tank in 3 minutes. Set Z has 8 pipes which can empty 5/10 of the tank in 10 minutes.

    ...view full instructions

    If one pipe is added for set X and capacity of set Y and set Z is increased by 20% on its original value and all the taps are opened at 2.58 p.m., then at what time does the tank get filled if the tank is initially empty?
    Solutions

    The rate per minute with the given changes (in percentage terms) would be:

    Set X =11%, Set Y = 15% and Set Z = –6%.

    Hence, the net rate = 11 + 15 – 6 = 20% per minute and it would take 5 minutes for the tank to fill.

    If all pipes are opened at 2:58 p.m., the tank would get filled at 3:03 p.m.

  • Question 6/10
    1 / -0.25

    Directions For Questions

    Direction: Study the information given below and answer the questions based on it.

    512   625   962   348  245

    ...view full instructions

    If the positions of first and third digits in the number are interchanged, which of the following will be the fourth highest number?

    Solutions

    After interchanging the positions of the first and the third numbers of the groups:
    215 526 269 843 542
    269 will be the fourth highest number. So the answer is a).

  • Question 7/10
    1 / -0.25

    Directions For Questions

    Direction: Study the information given below and answer the questions based on it.

    512   625   962   348  245

    ...view full instructions

    If in each element, all the three digits are arranged in ascending order within the number, which of the following will be third lowest number?
    Solutions
    After arranging all the three digits are in ascending order within the number we get: 125 256 269 348 245, third lowest number is 256. So answer is e).
  • Question 8/10
    1 / -0.25

    Directions For Questions

    Direction: Study the information given below and answer the questions based on it.

    512   625   962   348  245

    ...view full instructions

    If in each number, the first two digits are multiplied, which number will be the smallest?
    Solutions
    If in each number of the first two digits are multiply then we get:
    5*1=5
    6*2=12
    9*6=54
    3*4=12
    2*4=8
    Smallest number would we: 5 i.e.512. So answer is c).
  • Question 9/10
    1 / -0.25

    Directions For Questions

    Direction: Study the information given below and answer the questions based on it.

    512   625   962   348  245

    ...view full instructions

    If the positions of first and second numbers are interchanged, and one is added to the last digit of each of the numbers, then how many numbers thus formed will be odd numbers?
    Solutions
    If in the positions of the first and the second numbers are interchanged, and one is added to the last digit of each of the numbers then we get:
    153 266 693 439 426
    then three numbers will be formed as odd numbers. So answer is d).
  • Question 10/10
    1 / -0.25

    Directions For Questions

    Direction: Study the information given below and answer the questions based on it.

    512   625   962   348  245

    ...view full instructions

    What will be the resultant if the third digit of the lowest number and the second digit of the highest number are multiplied?
    Solutions
    Third digit of the lowest number =5
    Second digit of the highest number=6
    5*6=30
    So answer is b).
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