exam Maths Puzzle Numerical Ability

Solve for X, Y, and Z in the equation

a. X + 2Y + Z = 6

X + Y = 4

3X + Y + Z = 8

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exam Other Question

20x+50 over 15x-30

I have to simplify this. Here is what I did:

((20+50))/((15x-30)) = ((4x+10))/((3x-6)) = ((2(2x+5)))/((3(x-2)))

Please tell me if this is right. I hope so! This is for a test. Greta is making a cube with a surface area of 24 square feet.

If Greta triples the dimensions of the cube, what will the new surface area be?