A lending libary has a fixed charge for the first three days and an additional charge for each day thereafter.Saritha paid rs27 for a book kept for seven days , while susy paid rs21 for the book she kept for five days. Find the fixed charge and the charge for each extra day.
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x+4y=27 ---->1
x+2y=21----->2
by solving 1and 2
we get 2y=6
y=3
x+2y=21
x+2×3=21
x+6=21
x= 21-6
= 15
x+2y=21----->2
by solving 1and 2
we get 2y=6
y=3
x+2y=21
x+2×3=21
x+6=21
x= 21-6
= 15
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