Posted by nmdna on Saturday, September 15, 2012 at 9:59am.
y varies directly with x ----> y = kx , where k is a constant
20 = k(50
k = 2/5
y = (2/5)x
when y = 36
36 = (2/5)x
2x = 180
x = 90
or ... use a proportion
x/50 = 36/20
x = 50(36)/20 = 90
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