exam Maths Puzzle Numerical Ability

simplifly the following :

1) 3x^3 y^4 z^-2 / 6x^-1 y^3 z^-3

2)36^1/2 / 15^2

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Calculate the present value.
A=$20,000 r =12% compounded monthly, t=5 years Chris has four more than twice as many rocks in his wagon as Gordon has in his wagon. If he gives gordon six rocks, he will have one more than gordon. How many rocks does each boy have in his wagon right now?