Question 15
Some girls can do a piece of work in 18 days. In how much time (in days) two times the number of such girls will complete thrice of the work?
Solution
Let total work to be done = $$w$$ units
Time taken by $$n$$ girls to complete the work = 18 days
Let time taken by $$2n$$ girls to complete $$3w$$ units = $$d$$ days
Using, $$\frac{M_1D_1}{W_1}$$ $$=\frac{M_2D_2}{W_2}$$
=> $$\frac{n\times18}{w}=\frac{2n\times d}{3w}$$
=> $$d=18\times\frac{3}{2}=27$$ days
=> Ans - (B)
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