Xiaoli bought two books, the first one was 6.45 yuan, and the other was 4.29 yuan. How much did the two books cost in total?
小丽买了两本书，第一本6.45元，另一本4.29元，两本书一共花了多少元？
<gadget id="calculator">6.45 + 4.29</gadget>
<output>10.74</output>

<result>10.74</result>