Then, the ratio is (3x+5y)/(7x-4y) = 7/4
Cross-Multiplying we get 12x+20y = 49x-28y or 37x = 48y
Then x/y = 48/37
If (3x + 5y) : (7x - 4y) = 7 : 4 then how do you find the ratio x : y?
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2 Answers By Expert Tutors
Mark M. answered • 04/24/19
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(3x + 5y) : (7x - 4y) = 7 : 4
4(3x + 5y) = 7(7x - 4y)
12x + 20y = 49x - 28y
48y = 37x
48 : 37 :: x : y
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