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Question
If m : n = 4 : 9 and n : s : 3 : 7, find m : s
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Solution
m : n = 4 : 9
`"m"/"n" = 4/9`
and n : s : 3 : 7
∴ `"n"/"s" = 3/7`
∴ `"m"/"n" xx "n"/"s" = 4/9 xx 3/7`
`"m" : "s" = 4 : 21`
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