4:5= 12:x, the value of x, 10, 13, 14, 15, Given 2,4,16,8 arrange them to be proportion, 2:4 = 16:8, 4:2 = 8:16, 2:8 = 4:16, 4:16 = 8:2, 2:3 = n:21, the value of n, 10, 12, 14, 16, 3/4 = n/12, the value of n, 6, 7, 8, 9, x:4 =9:x, the value of x, 5, 6, 32, 36

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