exam Maths Puzzle Numerical Ability

A chemist needs 120 milliliters of a 59% solution but has only 32% and 68% solutions available. Find how many milliliters of each that should be mixed to get the disired solution.

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A boat can travel 5 miles upstream and 5 miles downstream in a total of 6 hours. If the speed of the current is 2 miles per hour, what is the speed of the boat in still water? I have two questions This question was from a worksheet with no text book info.
1. Let a,b,c,and d be points on a circle. Let w,x,y and z be the midpoints of the arcs ab,bc,cd and