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If 3A = 5B and 4B = 6C, then A : C is equal to :
2 : 5
3 : 5
4 : 5
5 : 2
If, A : B = 7 : 9 and B : C = 5 : 4, then A : B : C is:
7 : 45 : 36
28 : 36 : 35
35 : 45 : 36
none of these
If x : y = 3 : 2, then the ratio (2x2 + 3y2) : (3x2 − 2y2) is equal to:
5 : 3
6 : 5
12 : 5
30 : 19