The school cafeteria bought 150 kilograms of rice for the first time, and 180 kilometers of rice for the second time. The first time paid 60 yuan less than the second time. How much did you pay for the first time?
学校食堂第一次买大米150千克，第二次买大米180千米，第一次比第二次少付60元，第一次买大米付多少钱？
<gadget id="calculator">180 - 150</gadget>
<output>30</output>

<gadget id="calculator">60 / 30</gadget>
<output>2</output>

<gadget id="calculator">2 * 150</gadget>
<output>300</output>

<result>300</result>