Question

A lending library has a fixed charge for the first three days and an additional charge for each day thereafter. Saritha paid Rs.27 for a book kept for seven days, while Susy paid Rs.21 for the book she kept for five days. Find the fixed charge and the charge for each extra day.

Answer 1

let the fixed charge be x

number of days = y

then this equation forms

x+4y=27(three days are fixed so y is 4y and not 7y)-----(1)

x+2y=21----(2)

subract eq 1 and 2

x+4y=27

(-) x+2y=21

----------------------

2y = 6

y = 3

so additional charge is 3 rupees

x+12=27(substituting in eq 1)

x=15

FIXED CHARGE =15 RS

Answer 2

Step-by-step explanation:

Refer the attachment for your answer!