Consider the question. 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?
 What is the step-by-step reasoning process to arrive at the answer: 18?
Shelly bought 12 / 2 = 6 pretzels. Angie bought 6 * 3 = 18 pretzels.