An intelligent trader travels from one place to another carrying 3 sacks having 30 coconuts each. No sack can hold more than 30 coconuts. On the way he passes through 30 checkpoints and on each check point he has to give one coconut for each sack carrying.
How many coconuts are left in the end?

• on the first check point he give 3 coconut from first sack this continue upto 10 check point now first sack empty next check point he give 2 coconut from second sack this continue upto 25 checkpoint now second sack is empty now next checkpoint he give 1 coconut because one sack is carrying now continue he gave 1 coconut upto 30 checkpoint remaining coconut are 30-5=25 25 is the answer
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