If M : N = 4 : 9 and N : S : 3 : 7, Find M : S - Mathematics

If m : n = 4 : 9 and n : s : 3 : 7, find m : s

Sum

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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