Lizzy: Ms. Cole teaches math in three levels of classes in her school. There are four times as many students in Ms. Cole's fourth-level math class as in her sixth-level math class. The number of students in her seventh-level math class is twice that in the fourth-level math class. If Ms. Cole's sixth-level class has 40 students, how many math students does Ms. Cole teach?.
Me: Hmmm, let me think. I think this is the detailed solution:
Since Ms. Cole's sixth - level math class has 40 students and four times as many students in her fourth - level class, there are 4 * 40 = 160 in her fourth - level math class. For the two levels, Ms. Cole teaches math to 160 + 40 = 200 students. If the number of students in her seventh - level math class is twice that in the fourth - level math class, then she teaches 2 * 160 = 320 students in the seventh - level math class. Ms. Cole teaches 320 + 200 = 520 math students in the school. Final answer: 520.