Others Maths Puzzle

A,B,C,D each had some money.D doubled the amounts with the others.C then doubled the amounts with the others.B then doubled the amount with the others.A then doubled the amount with the others.At this stage,each of them had Rs 80.Find the initial amount with C.

A) 45
B) 65
C) 95
D) 85

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Others Other Question

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what the word states
If the sum of 101 distinct terms in arithmetic progression is zero, in how many ways can three of these terms be selected such that their sum is zero ?