To show love to the "Hope Project", Ding Ding donated 15.60 yuan, and Xiaoxiao donated 4.30 yuan more than Ding Ding. How much did they donate in total?
向"希望工程"献爱心，丁丁捐了15.60元，笑笑比丁丁多捐了4.30元．他们俩一共捐了多少元？
<gadget id="calculator">15.6 + 4.3 + 15.6</gadget>
<output>35.5</output>

<result>35.5</result>