Correct Answer: C
Explanation:
Answer is C.
Note that w:x = w/x and y: z = y/z. thus, w/x = y/z. Adding the opposite of y/z to both sides of the equation we get
w/x + (- y/z)= y/z + (- y/z)
w/x - y/z = 0
multiplying through by xz,the LCD, we have
(xy)(w/y)-(xy)(y/z)=(xy)(0)
wz – xy = 0
Hence, the quantities in both columns are equal.