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If \(x, y,\) and \(z\) are positive integers, \(x\) is a factor of \(2y,\) and \(3y\) is a factor of \(z,\) which of the following must also be an integer?
A) \(\dfrac{y}{x}\)
B) \(\dfrac{2y}6\)
C) \(\dfrac{xy}{3z}\)
D) \(\dfrac{zx}{3y}\)
E) \(\dfrac{zy}{3x}\)
Answer: D
Source: Princeton Review
A) \(\dfrac{y}{x}\)
B) \(\dfrac{2y}6\)
C) \(\dfrac{xy}{3z}\)
D) \(\dfrac{zx}{3y}\)
E) \(\dfrac{zy}{3x}\)
Answer: D
Source: Princeton Review
