Question

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

Answer 1

Answer:

Rs 80

Step-by-step explanation:

700/7=100

100-20=80

Answer 2

Answer:

Sn=700

n=7

d=-20

now,Sn=n/2[2a+(n-1)d]

700=7/2[2a+(7-1)(-20)]

700=7/2[2a+(6)(-20)]

700=7/2[2a-120]

700=7/2×2[a-60]

700/7=a-60

100=a-60

a=100+60

a=160

a1=160

a2=a+d

a2=160-20

a2=140

a3=a+2d

a3=160+2(-20)

a3=160-40

a3=120

similarly,a4=100

a5=80

a6=60

a7=40