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GRE - Quantitative Reasoning - System of equations

If y = 3x and z = 2y what is x + y + z in terms of x ? (more)

If y = 3x and z = 2y what is x y z in terms of x ?

A) 10x
B) 9x
C) 8x
D) 6x
E) 5x

given y = 3x

z = 2y = 2*3x = 6x

x + y + z = x + 3x + 6x = 10x

Option A is correct