book Maths Puzzle Numerical Ability

(27)1/3x-y
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(9)5/2x+2y

Please help!,how are you suppose to do this question? I'm stuck!

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book Other Question

Find the coordinaes of the vertex of the graph y=|x-2|+4. the first side of a triangle is 5 more than 3 times the third side. the second side is 5 less than twice the third side. if the perimeter is 60cm, how long is each side?