A) 3
B) 4
C) 5
D) 6
Correct Answer: B
Solution :
Sol. |
Let efficiency of man = x |
efficiency of woman = y |
\[\therefore \] According to question, |
\[(12x+5y)\times 2=(4x+3y)\times 5\] |
\[=24x+10y=20x+15y\] |
\[4x=5y\Rightarrow \,\frac{x}{y}\,=\frac{5}{4}\] |
\[\therefore \,\,\,x=5\,\,\,\,\Rightarrow \,\,\,\,y=4\] |
Now 8 men done the work in d days |
\[(12\times 5+5\times 4)\,\times 2\,=8\times 5\times d\] |
\[=(60+20)\times 2\] |
\[=40\times d\] |
\[d=\frac{80\times 2}{40}\,=4\,days\] |
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