exam Maths Puzzle Numerical Ability

Please help me with this problem:
I did this but I was told is wrong
36^1/2/15^2 = 6/225 = 2/75

Read Solution (Total 0)

exam Other Question

(3x^3y^5m^2)(x^2y)^-2
_______________________
x^2y^0y^-4

This problem needs to be simplified, so far I have (9x^4y^10m^4)(x^-4y^2)
Am I anywhere close to the correct answer? What is the coefficient of 6/x^2 and the variable part?