Angie bought three times as many pretzels at the mall as Shelly did. Shelly bought half as many pretzels as Barry. If Barry bought 12 pretzels, how many did Angie buy? Let's think first. Chain of thought:
Shelly bought 12 / 2 = 6 pretzels. Angie bought 6 * 3 = 18 pretzels.
Therefore, the answer is 18.