self Company Logical Reasoning

having 10 cigarette packets.9 packets having 10 gram cigarettes but in 1 packet 11 gram cigarettes are there.we are having digital weighing machine and need to weigh only one time.how to find which packet is having 11 gram cigaretts??

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self Other Question

A circular race track of length 100 m , 3 persons A,B,C start together .A and B start in same direction at speed of 10 and 8 m/s while C runs in opposite direction at speed of 15m/s when will all three meet for first time after start? having 27 balls one ball is less weight.all are looking similar.with simple balance find minimum number of times we need to weigh to know which ball is less weight??