Question

a lending library has a fixed charge for the first three days and additional charge for each day therefore Sarita paid rupees 27 for a book kept for seven days while Susy paid 21 for the book she kept for five days find the fixed charge and the charge the each extra day

Answer 1

Here u go the solution to ur question is given in the picture below

Answer 2

27-21=6
6/2=3
That is rs 3per day
Now 5*3+x=21
X=21-15=6
Fixed price is rs 6