Texas Integrated School has 15 classes and has 20 students per class.  They added five more classes, how many students will they have now?
The school has 15 x 20 = <<15*20=300>>300 students right now.
They have an additional 5 x 20 = <<5*20=100>>100 students after adding 5 more classes.
Therefore, Texas Integrated School will have a total of 300+100= <<300+100=400>>400 students.
#### 400