On Sunday, my father and mother took Xiaoming to Daying County to play. The one-way ticket price is 26.5 yuan for adults and 15 yuan for children. How much is their round-trip fare?
星期天爸爸、妈妈带小明到大英县游玩，单程车票价钱：成人26.5元，儿童15元．他们往返车费一共要用多少元？
<gadget id="calculator">26.5 * 2</gadget>
<output>53</output>

<gadget id="calculator">53 + 15</gadget>
<output>68</output>

<gadget id="calculator">68 * 2</gadget>
<output>136</output>

<result>136</result>