Mohini saved Rs5 in first week of a year and then increased his weekly saving by Rs1.75.If in the nth week her weekly savings becomes Rs20.75, find n

Asked by  | 25th Jan, 2012, 08:23: AM

Expert Answer:

We take a = 5, d = 1.75 and an = 20.75
So we have, a + (n - 1)d = 20.75
Or, 5 + (n - 1)(1.75) = 20.75
Or, (n - 1)(1.75) = 15.75
Or, n - 1 = 9
Or, n = 10

Answered by  | 25th Jan, 2012, 10:03: AM

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