A merchant has 310 kg of sugar, part of which he sells at 2% loss and the rest at 8% profit. He gains 5% on the whole. What is the difference between the quantities of sugar sold at 8% profit and that sold at 2% loss?

To fill a bucket, 25 jugs of water is required. How many jugs of water will be required to fill the same bucket if the capacity of jug is reduced to two-fifth of its present?