Question

$35$ inland letters cost $Rs87.50$. How many such letters can we buy for $Rs.315$?

Answer 1

Number of inland letters whose total cost is $Rs87.50=35$
Number of inland letters of whose cost is $Re1=\frac{35}{87.50}$

Number of inland letters whose cost is $Rs315=315\times \frac{35}{87.50}=\frac{11025}{87.50}=126$

Hence, we can buy $126$ inland letters for $Rs315.$