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?
Rs.$ \left(\dfrac{xy}{d} \right) $
Rs. (xd)
Rs. (yd)
Rs.$ \left(\dfrac{yd}{x} \right) $
Explanation:
Cost of $ x $ metres = Rs. d.
Cost of 1 metre = Rs.$ \left(\dfrac{d}{x} \right) $
Cost of $ y $ metres =$\left(\dfrac{d}{x}.y\right)$=Rs $\left(\dfrac{yd}{x}\right)$