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2014-04-17T09:38:08+03:00
X : 2 = y : 3 = k
3k - 2k = 15
k = 15
x = 30
y = 45


1 1 1
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2014-04-17T09:44:42+03:00
X/2=y/3=k       x-y=15      x/2=2k     y/3=3k      2k-3k=15     -k=15       k=-15         x=2*-15    x=-30        y=3*-15     y=-45        -30+45=15
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