Question

Ramkali saved 5 in the first week of a year and then increased her saving by is 1.75 if in the nth week her weekly savings become rupees 20.75 find n

Answer 1

Initial he saved 5
a=5 d=1.75 Tn=20.75
Tn=a+(n-1)d
20.75=5+(n-1)1.75
20.75=5+1.74n-1.75
20.75=1.75n+3.25
20.75-3.25=1.75n
17.5=1.75n
n=17.5/1.75
n=10 week
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Answer 2

Initial he saved 5

a=5 d=1.75 Tn=20.75

Tn=a+(n-1)d

20.75=5+(n-1)1.75

20.75=5+1.74n-1.75

20.75=1.75n+3.25

20.75-3.25=1.75n

17.5=1.75n

n=17.5/1.75

n=10 week