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.

Answer 1

Let the number of books sold by Rachel on Monday be m,
then according to question,
equation formed will be --
m+2m+(2m-6) = 19
5m = 19+6
5m = 25
m = 5
therefore, 5 books were sold by Rachel on Monday...

Hope so this answer will help you

Answer 2

Let the number of books sold on Monday, Tuesday and Wednesday be m,t,w.
Given that t = 2m   ......(1)
                  w = t - 6     can be written as   w = 2m - 6    .....(2)
                m + t + w = 19  .... (3) 
substitute 2 and 1 in 3,
     m + 2m + 2m - 6 = 19
        5m = 25
      m =5