Benito has $120 to go shopping. He spends $30 on a pair of jeans. Benito also wants to buy some rings that cost $18 each. He writes and solves an inequality to determine how many rings r can buy. What was his error?

5 rings

Explanation:

Given the following :

Cost of ring = $18 per ring

Total amount held = $120

Amount spent on jeans = $30

The number of rings Benito can buy can be represented as :

The total cost of rings plus the cost of jeans should be less or equal to the total amount held.

Total cost of rings ($18 * r) + Cost of jeans ≤ Total amount held

18r + 30 ≤ 120

18r ≤ 120 - 30

18r ≤ 90

r ≤ 90/18

r ≤ 5

i am sure the answer is d