Quantitative Aptitude Ques 2270

Question: X can do 20% of a work in a day. Y can do 25% of the same work in a day and X, Y and Z together can do 50% of the same work in a day. How many per cent of work can be done by Z in a day?

Options:

A) 5%

B) 7%

C) 10%

D) 13%

Show Answer

Answer:

Correct Answer: A

Solution:

  • Per cent of work done by X in a day = 20% Per cent of work done by Y in a day = 25% Total work done by X, Y and Z in a day = 50% $ 20%+25%+Z=50% $ $ Z=50-(45%) $

$ \therefore $ Work done by Z = 5%

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