a:b 7:4 हो तो (5a - 6b) : (3a + 11b) =?
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a:b = 7:4 (let a=7 and b=4)
(5a - 6b) = 5*7 - 6*4 = 11 -------------------------(1)
(3a + 11b) = 3*7 + 11*4 = 65 ---------------------(2)
Therefore the answer is 11:65
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