exam Maths Puzzle Numerical Ability

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

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exam Other Question
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 ) Graph the set {x|<_ x <_ 5 on a number line (-7 through 7). Also write the set using interval notation



NOTE: <_ means less than or equal to.