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Answer:
Luis Salary is 1800 dollars
Step-by-step explanation:
Ration of Luis´s salary and Andres´s salary is 5:3
[tex]\frac{L}{A} = \frac{5}{3}\\3L -5A = 0[/tex] -- Eq (1)
Let Luis salary be X
Then Andrews salary in July would be A + 720 while Luis salary in July is L
L = A + 720 ---E q (2)
Substituting the values in above equation 1, we get -
[tex]3 ( A +720 ) -5A = 0\\2 A = 720 *3\\A = 1080[/tex]
Luis Salary is
[tex]A + 720 = 1800[/tex]