exam Maths Puzzle Numerical Ability

Assume that y varies inversely as x, and y=18 when x=3. Find the constant of variation.

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exam Other Question

3x^2-7x=0

3x^2+33=2x^2+14x

(x-3)^2=9

(3x-6)^2=4x^2
Hello,
I have worked this problem out several times. I cannot seem to come up with the correct answer.
6ax+2a-15x-5
Can anyone help me?
Thanks!