exam Maths Puzzle Numerical Ability

help finding values of x and y in parallelograms PQRS
PT=x+2,TR=y,QT=2x,TS=y+3

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i want to know how do you do this problem having troble with math homework please help me!

x+3(2x-5) If z varies jointly with the product of x and y, find the constant of variation, k, given x=1/2, y=8, z=12.
Enter only the numerical value of k.