A truck transports 5 tons of goods each time, and 18 such trucks transport 810 tons of goods, how many times do they need to be transported?
一辆卡车每次运货5吨，18辆这样的卡车运810吨货物，需要运多少次？
<gadget id="calculator">5 * 18</gadget>
<output>90</output>

<gadget id="calculator">810 / 90</gadget>
<output>9</output>

<result>9</result>