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Ramkali saved rupees 5 in first …

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Ramkali saved rupees 5 in first week of a year and then increased her weekly saving by rupees 1.75 if in the Nth week her weekly saving become rupees 20.75 find n
  • 1 answers

Sia ? 5 years, 8 months ago

Here, a = Rs 5
d = Rs 1.75
an = Rs 20.75
We know that
an = a + (n - 1)d
 20.75 = 5 + (n - 1)d
 (n - 1) (1.75) = 20.75 - 5
 (n - 1) (1.75) = 15.75
n1=15.751.75
 n - 1 = 9
 n = 10
Hence, the required value of n is 10.

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