exam Maths Puzzle Numerical Ability

solve
3x^3 +4x^2y-6xy^2

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exam Other Question

Some students simplify:
2x^2 - 32 / x-4 as 2x^2 - 32 / x-4 = 2x-8

Choose values of x to show this is not true. Then simplify it correctly.

May be someone could help me with thise problem.
express the following as ratios having the same units in the numerator and denominator: 50 inches to 3 yards, 20 months to 3 years, 4 pounds to 42 ounces, 8 quarters to 12 dimes