Question

The cost of 1 pen is Rs 16 and the cost of 1 pencil is Rs 5. What is the total cost of x pens and y pencils.

Answer 1

Cost of 1 pen = Rs 16
∴ Cost of 'x' pens = Rs 16 $\times$ x
= Rs 16x
Similarly, cost of 1 pencil = Rs 5
∴ Cost of 'y' pencils = Rs 5$\times$y
= Rs 5y
∴ Total cost of x pens and y pencils = Rs (16x + 5y)