Bob picked 450 apples for his entire family to eat. There are 33 children in his family, and each of them ate 10 apples. If every adult ate 3 apples apiece, how many adults are in his family? Let's answer step by step:
The 33 children ate a total of 33 * 10 = 330 apples. There were 450 - 330 = 120 apples left for the adults to eat. If every adult ate 3 of the 120 apples left, then there were 120 / 3 = 40 adults in the family. The answer: 40.