A) 15
B) 14
C) 13
D) 11
Correct Answer: D
Solution :
Work done in x days, then \[\frac{x}{24}+\frac{x}{30}+\frac{x-4}{40}=1\] \[\Rightarrow \] \[\frac{5x+4x+3x-12}{120}=1\] \[\Rightarrow \,\] \[12x-12=120\] \[\Rightarrow \,\] \[12x=132\] \[\therefore \,\] \[x\,=\,11\]You need to login to perform this action.
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