Solution
a:b:c= $$\left(a\times\ b\right):\left(b\times\ b\right):\left(b\times c\right)$$
=$$\left(2\times\ 6\right):\left(3\times\ 6\right):\left(3\times\ 5\right)$$
= 12 : 18 : 15 = 4 : 6 : 5
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