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Question

Is 3:5 and 12:20 in a proportion? Why not?

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Solution

Yes, they are in proportion.
For a set of ratios a:b and c:d to be in proportion (a:b :: c:d) , they should satisfy the condition
b×c=a×d
For 3:5 and 12:20,
5×12=3×20
60 = 60
Hence they are in proportion.

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