Let fixed charge be ₹x and daily extra charge ₹y. Saritha kept it 7 days: x + 4y = 27. Susy kept it 5 days: x + 2y = 21. Subtracting gives 2y = 6, so y = 3 and ...
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Let fixed charge be ₹x and daily extra charge ₹y. Saritha kept it 7 days: x + 4y = 27. Susy kept it 5 days: x + 2y = 21. Subtracting gives 2y = 6, so y = 3 and ...