exam Maths Puzzle Numerical Ability

An object will fall m feet in n seconds. How long will it take for a quarter to hit the ground if it is dropped from the top of a tower that is 1454 feet tall?

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The function, p(d) = 1 + d/33 gives the pressure, in atmospheres (atm) at a depth d in the sea (d is in feet). Note that p(0) = 1 atm, p(33 Jane has 116 more marbles than Mary has. If their mother gives 18 marbles to each of them, Jane will have 5 times as many marbles as Mary. How many marbles does Mary have before her mother gives them any more?