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Ramkali saved Rs. 5 in the first week of a year and then increased her weekly savings by Rs. 1.75. If in the nth week, her savings become Rs. 20.75, find n.

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Solution: 20.75 = 5 + 1.75(n-1)
Or, 1.75(n-1) = 15.75
Or, n-1 = 9
Or, n = 10

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