35 inland letters cost Rupees 87.50. How many such letters can we buy for Rupees 315?
Given 35 inland letters costs rupees 87.50
So, for rupees 1 we can buy = 35 / 87.50
= 0.4 inland letters
To buy for rupees 315 = 0.4 × 315
= 126 letters
Hence, we can buy 126 inland letters for rupees 315
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