if a:b=1.5:3.5 and b:c=5:6 ,find a :c
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a:b=3:7
b:c=5:6
a=3b/7
c=6b/5
now..
a:c=3b/7:6b/5
a:c=7:10
b:c=5:6
a=3b/7
c=6b/5
now..
a:c=3b/7:6b/5
a:c=7:10
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