36 men together can build a wall 140 m long in 21 days ; the number of men working at the same rate required to build the same wall in 14 days is
$$M_1=36$$ , $$D_1=21$$
$$M_2=x$$ , $$D_2=14$$
Using, $$M_1D_1$$ =Â $$M_2D_2$$
=> $$36 \times 21 = x \times 14$$
=> $$x=36 \times \frac{21}{14}$$
=> $$x=18 \times 3=54$$
=> Ans - (A)
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