A) 10 days
B) 8 days
C) 12 days
D) 15 days
Correct Answer: C
Solution :
Work done by (A + B) in 1 day \[=\frac{1}{15}+\frac{1}{10}\] \[=\frac{2+3}{30}=\frac{5}{30}=\frac{1}{6}\] \[\therefore \] (A + B)? 2 day's work\[=\frac{2}{6}=\frac{1}{3}\] Remaining work\[=1-\frac{1}{3}=\frac{2}{3}.\] This part is done by A alone. \[\because \] 1 work is done by A in 15 days. \[\therefore \] \[\frac{2}{3}\] work is done in \[15\times \frac{2}{3}=10\] days \[\therefore \] Required number of days \[=10+2=12\]You need to login to perform this action.
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