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A sum of 700rs is to …

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A sum of 700rs is to be used to given seven cash prizes to students of a school for their overall academic performance. If each prizes is 20rs. Less than the its preceding prize find the value of each prize.

Posted by Tanmay Bareja 7 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Suraj Gupta 7 years, 2 months ago

Given, Sn=700 & d=20 therefore Sn=n/2(2a+(n-1)d) 700 =7/2(2a+(7-1)-20) 1400/7=(2a+(-120)) 200=2a-120 200+120=2a 2a=320 a=320/2 a=160 now,Ap =160,140,120,100,80,60,40

1Thank You

Ayush Sahu 7 years, 2 months ago

Here n=7 sn=700 d=-20

1Thank You

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CBSE > Class 10 > Mathematics