Question 1023899
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At East Carolina University the ratio of males to females is 5:4. If there are 45,000 total students, how many of them are males?
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Your system of equations is 

{{{m/f}}} = {{{5/4}}},             (1)

m + f = 45000.       (2)

From (1), m = {{{(5/4)*f}}}.

Substitute it into (2). You will get

{{{(5/4)*f + f}}} = {{{45000}}},   or

{{{(9/4)*f}}} = {{{45000}}}.

Hence, f = {{{(45000*4)/9}}} = 5000*4 = 20000 femails.

Then m = 25000 males.
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