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Question

a : b = 2 : 3 , b : c = 4 : 5 , c : d = 6 : 7 . Find a : b : c : d.

Solution
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Given a:b=2:3,b:c=4:5,c:d=6:7
a:b=2×8:3×8=16:24b:c=4×6:5×6=24:30c:d=6×5:7×5=30:35soa:b:c:d=16:24:30:35

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