Rob has 24 baseball cards, and a few are doubles. One third of Rob's cards are doubles, and Jess has 5 times as many doubles as Rob. How many doubles baseball cards does Jess have?
Think hard. Detailed solution:
40
Rob has 24 / 3 = 8 doubles baseball cards.

Jess has 8 * 5 = 40 doubles baseball cards.

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So, the final answer is 40