Xiaohong goes to the bookstore to buy books. The fairy tale book is 13.5 yuan/book, the animal world is 20.57 yuan/book, and the composition book is 15.64 yuan/book. She bought one of each of the three books. How much did she spend in total?
小红到书店买书，童话书13.5元/本，动物世界20.57元/本，作文书15.64元/本，她三种书各买一本，一共花了多少钱？
<gadget id="calculator">13.5 + 20.57 + 15.64</gadget>
<output>49.71</output>

<result>49.71</result>