exam Maths Puzzle Numerical Ability

will you please help me with this: what is (12a+6/5a^2)(6/a+1)(5a+5/2a+1)

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exam Other Question

an airplane tooke 2 hours to fly 600 km against a head wind. The return trip with the wind took 1 2/3 hours. Find the speed of the plane in still air. A plant whose height is 8 cm, is growing at a rate of 4/5 cm per week. When will its height exceed 13 3/5 cm?

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