Dad took Xiaojun to travel abroad. Dad bought a train ticket for 250 yuan, and Xiaojun only needs to buy half the ticket. How much does it cost them to buy a round-trip train ticket?
爸爸带小军去外地旅游．爸爸买了一张火车票花了250元，小军只需买半票．他们购买来回火车票一共要花多少元？
<gadget id="calculator">250 / 2</gadget>
<output>125</output>

<gadget id="calculator">250 + 125</gadget>
<output>375</output>

<gadget id="calculator">375 * 2</gadget>
<output>750</output>

<result>750</result>