Question

Rachel works at a bookstore. On Tuesday, she sold twice as many books as she did on Monday. On Wednesday, she

sold 6 fewer books than she did on Tuesday. During the three days Rachel sold 19 books. Create an equation that can
be used to find m, the number of books Rachel sold on Monday.
Equation:

Answer 1

m +2m +(2m -6) = 19

Explanation:

m = number of books sold on Monday.

2m = number of books sold on Tuesday, twice as many as Monday.

2m -6 = number of books sold on Wednesday, 6 fewer than Tuesday.

The total number of books sold on the three days gives the equation you're looking for:

m +2m +(2m -6) = 19

_____

Additional comment

Solving this gives ...

5m = 25 . . . . add 6

m = 5 . . . . . divide by 5

5, 10, and 4 books were sold on the three days.