Arrange the following ratios in ascending order of magnitude :2 : 3, 17 : 21, 11 : 14 and 5 : 7.
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If A : B = 2 : 3, B : C = 4 : 5 and C : D = 6 : 7, find A : D.
If x : y = 2 : 3 and y : z = 4 : 7, find x : y : z.