Final answer:
Mariah can buy 3 rings.
Step-by-step explanation:
To determine how many rings Mariah can buy, we need to calculate the money she has left after buying the shirts. She earned $60 and spent $15 x 2 = $30 on the shirts. This leaves her with $60 - $30 = $30. Next, we divide the remaining money ($30) by the price of each ring ($10) to find out how many rings she can buy. So, she can buy $30 / $10 = 3 rings.