Question

Lisa works at a music store. Last week she sold 6 more than 3 times the number of CDs that she sold this

week. Lisa sold a total of 110 CDs over the two weeks. Find the number of CDs she sold last week and the

number of CDs she sold this week.

Answer 1

This week sales = 26

Last week sales = 84

Explanation:

Let this week sales = x

Sales last week = 6 + 3x

Sales last week + this week = 110

x + (6 + 3x) = 110

x + 6 + 3x = 110

6 + 4x = 110

4x = 110 - 6

4x = 104

x = 26

This week sales = 26

Last week sales = 6 + 3(26) = 84