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Verified answer
A: b = 3/4a = 3b/4
6a + b = 6(3b/4) + b = 18b/4 + b = 22b/4 = 11b/2
4a + 5b= 4 (3b/4) + 5b = 3b + 5b = 8b
(6a+b) : (4a+5b) = 11b/2 : 8b = 11 : 16