exam Maths Puzzle Numerical Ability

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

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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. How do I find and interpret the cost, in thousands of dollars, of producing q kg of a chemical given by C = f(q) = 100 + 0.2q?