IBM Company Numerical Ability Pipes and Cistern

A can fill a tank in 6 hours and B can fill the tank in 4 hours. if both the pipes are opened alternatively for an hour with A as the first then in how many hours will the tank b filled?

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IBM Other Question

A container contains pure milk. if 20% is replaced by water and then the same processes is repeated twice then what will b the % of milk remaining? In 50 coins 1 is defective (more weight) .in how many weighs can u find the defective coin?