Question

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

Answer 1

Answer:

a=5, d=1.75, a

n

=20.75

a

n

=a+(n−1)d

Subsituting the values in above equation,

20.75=5+(n−1)×1.75

15.75=(n−1)(1.75)

⇒n−1=

1.75

15.75

⇒n−1=9

⇒n=10

n=10.