If 3A = 5B = 6C, find A : B : C.
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If A : B = 5 : 6 and B : C = 9 : 11, find (i) A : C (ii) A : B : C.
If P : Q = 7 : 4 and Q : R = 5 : 14, find (i) R : P (ii) P : Q : R.
If a : b = 8 : 5, find (7a + 5b) : (8a − 9b).