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

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exam Other Question

Please help.

5 sq.root 75-6 sq.root 3
Simplify:

5 sq root 2(7 sq root 8 + 5 sq root 3)