if a:b=2:7,c:d=2:1 and b:d = 5:4 then find a:c
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Step-by-step explanation:
a/b=2/7,c/d=2/1,b/d=5/4
a/b.d/c.b/d=2/7.1/2.5/4
a/c=5/28
a:c=5:28
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