If x,y and z are positive integers, and 30x=35y=42z, then which of the following must be divisible by 3?
I. x
II. y
III. z Choose the correct choice.
A) I B) II C) III D) I & III E) I, II & III
30X=35y=42z   x=35y/30---now check whether x is divisible by 3--35y/30 is not divisible by 3   y=30X/35---divisible by 3   z=35y/42----not divisible by 3   hence y is only divisible by 3.   Answer:II
<result>B</result>
If x,y and z are positive integers, and 30x=35y=42z, then which of the following must be divisible by 3?
I. x
II. y
III. z