3 Ms. Jones teaches 6 classes a day. Each class has 30 students. After school she coaches the softball team. There are 10 students on the softball team that do not have a class with
Ms. Jones. How many different students does Ms. Jones work with each day?

190

Step-by-step explanation:

30x6=180+10=190

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.