Question

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


ANSWER: Sn=700 ;
n=7 ; a=? ; d= 20

Sn= n/2(2a+(n-1)*d)
$n \div2(2a +( 7 - 1) \times 20)$
700=7/2(2a +(7-1)20)
700*2=7(2a+(6)*20)
1400=7(2a+120)
1400/7=(2a+120)
200=2a+120
200-120=2a
80=2a
a=80/2
a=40


the other 4 A.P's are...

40+20=60
60+20=80
80+20=100
100+20=120

THE A.P's ARE :
40,60,80,100,120....
​

Answer 1

Answer:

yes ,... this answer is. correct... but why are u posting it dear....

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sneha ❤️....