If the cost of x metres of wire is d rupees, then what is the cost of y metres of wire at the same rate?
A. Rs. $$ {\frac{{{\text{xy}}}}{{\text{d}}}} $$
B. $${\text{Rs}}{\text{.}} {xd} $$
C. $${\text{Rs}}{\text{.}} {yd} $$
D. Rs. $$ {\frac{{{\text{yd}}}}{{\text{x}}}} $$
Answer: Option D
Solution(By Examveda Team)
$$\eqalign{
& {\text{Cost of }}x{\text{ metres}} \cr
& = {\text{Rs}}{\text{. }}d \cr
& {\text{Coast of 1 metre}} \cr
& = {\text{Rs}}{\text{.}}\left( {\frac{d}{x}} \right) \cr
& {\text{Cost of }}y{\text{ metres}} \cr
& = {\text{Rs}}{\text{.}}\left( {\frac{d}{x} \times y} \right) \cr
& = {\text{Rs}}{\text{.}} {\frac{{yd}}{x}} \cr} $$
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