Question 965882

Let &nbsp;<B>x</B>&nbsp; be the number of bills of &nbsp;$1.
Then the number of bills of &nbsp;$5&nbsp; is &nbsp;27-x, &nbsp;in accordance with the condition.


It gives an equation 

x + 5*(27-x) = 75.


To solve it, &nbsp;open parentheses and reduce the like terms:


x + 5*27 - 5x = 75,

-4x = 75 - 5*27,

-4x = 75 - 135,

-4x = -60,

4x = 60,

x = 15.


<B>Answer</B>. &nbsp;You need &nbsp;15&nbsp; bills of &nbsp;$1&nbsp; and &nbsp;27-15 = 12&nbsp; bills of &nbsp;$5.