Latest self Aptitude Question SOLUTION: If a person starts contributing certain amount(rs.) daily and adds Rs 2 more to its previous day's contribution. After 25 days, his total contribution is Rs. 675,With what amount h

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(#M40018036) SELF question Keep an EYE

If a person starts contributing certain amount(rs.) daily and adds Rs 2 more to its previous day's contribution. After 25 days, his total contribution is Rs. 675,With what amount he started on day one ?

Devendra Marghade (11 years ago)

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Dr.Dipin Singh  (11 years ago)

Initial amount on day 1= Rs 3.


If initial amount is 'a', then
675= (25/2)*(2a +(25-1)*2)= (25/2)*(2a +48)
2a+48= 675*2/25=54
2a=6
a=3

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ABHISHEK SRIVASTAVA  (11 years ago)

Let first day's contri be Rs x.
Then,
Total contri will be
x+(x+2)+(x+4)+.....upto 25days
=25x+(2+4+....24terms)
=25x+Sum of 24 terms in an AP where a=2 and n=24 and d=2
=25x+(n/2)(2a +(n-1)d)
=25x+(24/2)(2*2 + (24-1)*2)
=25x+600
and dis is given as Rs 675
Therefore,
25x+600=675
which results in x=3.
Therefore, The person started with Rs 3 on day one

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