Xiaolan's family of three went to visit the "Underwater World". According to regulations: each ticket is 125 yuan, and students can buy tickets at half price with their student ID cards. How much does Xiaolan's family spend at least?
小兰一家三口去游"海底世界"，按规定：每张门票125元，学生凭学生证可以半价购票，小兰一家至少要花多少元？
<gadget id="calculator">125 / 2</gadget>
<output>125/2 = around 62.5</output>

<gadget id="calculator">125 * 2</gadget>
<output>250</output>

<gadget id="calculator">(125/2) + 250</gadget>
<output>625/2 = around 312.5</output>

<result>625/2 = around 312.5</result>