There are 5 different science books and 3 different story books on the bookshelf. If one book is taken from each, how many different ways are there?
书架上有5本不同的科技书，3本不同的故事书，如果从中各取一本书，那么有多少种不同的取法？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>