a lending library has a fixed charge for first three days and an additional charge for each day thereafter sarita paid ₹27 for a book kept for sevev days while susy paid ₹21 for the book she kept for five days find the fixed and the charge for each extra day
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let the charge for 1st 3 days be x
additional charge be y
charges paid by sarita for 7 days = 27
=> x + 4y = 27....... (i)
charge paid by susy for 5 days= 25
=> x + 2y = 21........(ii)
from i and ii
2y = 6
y=3......(iii)
for y=3
x= 27-4(3).........(from i)
=> x= 20
charges for 1st 3 days = Rs 20
additional charge= Rs 3
additional charge be y
charges paid by sarita for 7 days = 27
=> x + 4y = 27....... (i)
charge paid by susy for 5 days= 25
=> x + 2y = 21........(ii)
from i and ii
2y = 6
y=3......(iii)
for y=3
x= 27-4(3).........(from i)
=> x= 20
charges for 1st 3 days = Rs 20
additional charge= Rs 3
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