exam Maths Puzzle Numerical Ability

can you help me solve the square root of xy^-1 divided by the square root of x^3 y

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exam Other Question

Solve the following equation:
4ax + by = 11ab
8ax - 5by = ab The relative density of an object may be defined as its weight in air Wa, divided by the difference of its weight in air and its weight when submerged in water, Ww. For a lead weight, Wa = 1.097 Ww. Find the relative density of lead.