Our family of three (father, mother, Xiao Ming) and our cousin go to the park together. How much should we pay for the tickets? Ticket purchase instructions: 40 yuan per person for adults, half price for children.
我们一家三口(爸爸、妈妈、小明)，另外还有我们家的表叔一起去公园玩，该付门票多少钱？购票须知：成人40元/人，儿童半价．
<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">120 + 20</gadget>
<output>140</output>

<result>140</result>