Posted by chris on Wednesday, September 19, 2012 at 12:10pm.
since y varies directly with x, there is some constant k such that
y = k*x
Since y=20 when x=50,
20 = k*50
k = 2/5
Now you know k, and you can figure things out for other values
36 = 2/5 * x
x = 90
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