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boy has 15 puzzles & 27 CDs. He takes 1 Puzzle & 1 CD on trips How many trips can he take with different puzzle and CD pair

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1 Answer

CD #1 can be paired with any one of the 15 puzzles, so that is 15 trips.
CD #2 can be paired with any one of the 15 puzzles, so that is 15 more trips.
CD #3 can be paired with any one of the 15 puzzles, so that is 15 more trips.
Each of the 27 CDs can be paired with each of the 15 puzzles.
27x15=405 trips can be taken