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

[math_celebrity]

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 3 days Rachel sold 19 books. Create an equation that can be used to find m, a number of books Rachel sold on Monday.

Let me be the number of books Rachel sold on Monday. We're given Tuesday's book sales (t) and Wednesday's books sales (w) as:

1. t = 2m
2. w = t - 6
3. m + t + w = 19

Plug (1) and (2) into (3):
Since t = 2m and w = t - 6 --> 2m - 6, we have:
m + 2m + 2m - 6 = 19

Combine like terms:
5m - 6 = 19

Plugging this equation into our search engine, we get:
m = 5