A sum of Rs.1600 is to be used, to give 10 cash prizes to students of school, for their overall academic performances. If each prize is Rs. 20 less than its preceding prize, find the value of each of the prizes.
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x - 20, x - 40, x - 60, x- 80, x- 100, x - 120, x-140, x-160, x-180
sum of abive qty is 10x - 900 = 1600
10x = 2500
x = 250
2 nd price = 230
3 rd price = 210
and so on.... 190, 170, 150, 130, 110, 90,
and last on is 70