A) 18
B) 17
C) 16
D) 15
Correct Answer: C
Solution :
One day work of (A and B) \[P+Q=\frac{1}{25}+\frac{1}{30}=\frac{11}{150}\] One day work of (B and C) \[\left( P+Q \right)\] One day work of (C and A) \[=\frac{11}{150}\times 5=\frac{11}{30}\] \[=1-\frac{11}{30}=\frac{19}{30}\]?s one day work \[\frac{19}{30}\] So one day work of \[\frac{19}{30}\times 30=19\] So total work = 16 days.
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