Karen got new clothes for her birthday. She got three new skirts in red, blue, and green. She also got a pair of jeans and a pair of black pants. To top it off, she got new boots and new tennis shoes. With the new clothes she got for her birthday, how many outfit combinations can Karen make?

step-by-step explanation:

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.