Question 20:
Ramkali saved Rs 5 in the first week of a year and then increased her weekly saving by Rs 1.75. If in the nth week, her week, her weekly savings become Rs 20.75, find n.
Answer:
Given that,
a = 5
d = 1.75
an = 20.75
n = ?
an = a + (n − 1) d
n − 1 = 9
n = 10
Hence, n is 10.
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