Question

A lending library has a fixed charge for the first three days and an additional charge for each day thereafter. Shristi paid Rs. 27 for a book kept for seven days, while Rekha paid Rs. 21 for the book she kept for five days. Find the fixed charge and the additional charge paid by them. What is the importance of library ?

Answer 1

Let fixed charges for reading book = Rs. x

Let additional charges per day = Rs. y