| 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? |
A) 5%
B) 7%
C) 10%
D) 13%
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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