A truck weighs (37/2) tons with coal, and after half of it is unloaded, it weighs (23/2) tons with coal. How many tons does this truck weigh?
一辆卡车，连煤带车重(37/2)吨，卸下一半后，连煤带车重(23/2)吨，这辆卡车重多少吨？
<gadget id="calculator">37 / 2</gadget>
<output>37/2 = around 18.5</output>

<gadget id="calculator">23 / 2</gadget>
<output>23/2 = around 11.5</output>

<gadget id="calculator">(37/2) - (23/2)</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">(37/2) - 14</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>