exam Maths Puzzle Numerical Ability

Find x:y:z, if 2x+y-5z = 0 and 3x-2y-4z=0
a)1:2:1 b)1:1:1 c)1:1:2 d)2:1:1

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exam Other Question

1. If the lenght of a rectangle is doubled, does the area double? Why or why not?

2. If the height and the base of a triangle are doubled, what happens to the area? Explain. Solve x^2=50, x is a real number. Simplify as much as possible. If there is more than one solution, separate by commas