9) If a : b = 5:7, then the ratio (5a + 7b): (3a + 4b) is
A) 43: 74
B) 76:43
C) 74:43
D) 43: 76
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Correct option is (C)
a = 5b/7
25b/7 + 7b : 15b/7 + 4b == 74:43
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