exam Maths Puzzle Numerical Ability

Perform the indicated operation. Simplify if possible

5x/x^2-7x+10 - 10/x^2-7x+10

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exam Other Question

How much pure water must be mixed with 4 pints of 90% developer to produce a mixture that is 19% developer? This has to do with properties, (3*2)+(3*8)=3(2+8) Is this "commutative" or "associative"