Question

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 weekly savings become Rs 20.75, find n.

Answer 1

Given , a = 5, d = 1.75, a_n = 20.75, n = ?

In A.P. n^th term is given by

a_n = a + (n − 1) d

n − 1 = 9

n = 10

Hence, n is 10.