Xiaofan has 13.5 yuan and Xiaofang has 11.3 yuan. The two are going to buy a set of books together, and the difference is 5.2 yuan. How much is the price of this set of books?
小凡有13.5元钱，小方有11.3元钱，两个人准备合买一套书，还差5.2元，这套书售价是多少元？
<gadget id="calculator">13.5 + 11.3 + 5.2</gadget>
<output>30</output>

<result>30</result>