By selling old CDs, Sarah has a store credit for $153. A new CD cost $18. What are the possible numbers of a new CDs Sarah can buy.

Question

Write and solve an inequality for each problem.

 

Answer 1

Angela, 153/18 = 8 1/2, since she can't buy half a CD, she's limited to no more than 8 CDs.

 

If x = the cost of one CD, then x CDs cost $18x. Since we are limited to $153, our equation looks like...

 

18x < 153

    x < 8 1/2

 

Again, since we can't buy half a CD, your answer should actually be...

 

x ≤ 8 since we can buy 8 CDs or fewer.