A teacher has 15 weeks in which to teach six chapters. Write and then solve an equation, showing all work, that represents the number of lessons the teacher must teach per week if there is an average of 8.5 lessons per chapter.

3.4 lessons per week

Step-by-step explanation:

So to find the number of lessons for 6 chapters we need to multiply 8.5 by 6:

8.5 * 6 = x

x = 51 - so we need 51 lessons to finish six chapters

To find the number of lessons per week, we need to divide the number of lessons by the number of weeks:

y = 51 : 15

y = 3.4

So the teacher needs 3.4 lessons per week to teach 6 chapters in 15 weeks.