exam Maths Puzzle Numerical Ability

A sailboat travels 20 miles downstream in 3 hours. It returns in 4 hours. Find the speed of the sailboat in still water and the rate of the current. (using the 5- step method )

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Hi. Can I have some help with the following problem?
An appliance dealer advertises a 15% discount on all his washing machines. In addition, the manufacturer offers a $80 rebate o 1.How many quarts of pure alcohol must be added to 10 quarts of a 15% alcohol solution to obtain a mixture which is 25% alcohol? All percentages are by volume