a sum of rs 1400 is to be used to give 7 cash prizes two students of a school for their overall academic performance if each price is rupees 40 less
than the preceding price find the value of each prise
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Answer:
Step-by-step explanation:
consider the series as an AP series
where
first element = a
common difference(d)=-20
no of elements(n) =7
sum of all elements(s)= 700
s=n/2 (2a+(n-1)d)
700=7/2 (2a+(7-1)(-20))
200=2a-120
320=2a
a=160
hence the series will be
160,140,120,100,80,60,40
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