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1. 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. $\frac{xy}{d}$

B. $Rs . x d$

C. $Rs . y d$

D. Rs. $\frac{yd}{x}$

Solution:

\begin{aligned} Cost of x metres \\ = Rs . d \\ Coast of 1 metre \\ = Rs . (\frac{d}{x}) \\ Cost of y metres \\ = Rs . (\frac{d}{x} \times y) \\ = Rs . \frac{y d}{x} \end{aligned}

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