exam Maths Puzzle Numerical Ability

720-2=1/6

5280+1760+63360=1

This is my 6th graders homework assignment. Please help!!!

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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. Solve 1/T = 1/W - 2/D for W.