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Question
If 5a + 3b : 3a + 5b = 3 : 4, find a : b.
Sum
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Solution
`(5a + 3b)/(3a + 5b) = 3/4`
4(5a + 3b) = 3(3a + 5b)
20a + 12b = 9a + 15b
20a − 9a = 15b − 12b
11a = 3b
a : b = 3 : 11
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