On Sunday, Xiao Ming went to the park with his father and mother, 15 yuan for adults and 8 yuan for children. How much does Xiao Ming's family pay?
星期天，小明和爸爸、妈妈一起去公园玩，成人15元，儿童8元．小明一家人应付多少元？
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">30 + 8</gadget>
<output>38</output>

<result>38</result>