Ramu is coconut seller who lives in place A. He has to sell his coconuts at place B.
He has 3 bags of coconuts in which there are 30 coconuts each. To reach B he has to cross
30 tolls. In 1 toll he has 1 coconut for 1 bag as a fee. How much coconuts will remain with him when he reaches B?
(hint ans=0)
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for the first 10 trolls he will give 3 coconuts from one bag as fee, this mean he well scarify one bag. and now he has just "2 bags" than for next 15 trolls he will do same (scarifying second bag). finally he left just one bag and 5 last trolls.