from 3x = 4y ---> x = 4y/3
from 12y = 5z --> z = 12y/5
so z/x = (12y/5) / (4y/3)
= (12y/5)(3/4y)
= 9/5
For nonzero numbers x,y, and z, 3x=4y and 12y=5z. What is z/x?
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