Question

35 inland letters cost Rs 87.50. How many such letters can we buy for 315?

Answer 1

Number of inland letters whose total cost is Rs 87.50 = 35

Number of inland letters of whose cost is Re 1 = `35/87.50`

Number of inland letters whose cost is Rs 315 = `315​ × 35/87.50 = 11025/87.50 = 126`

Hence, we can buy 126 inland letters for Rs 315.