A batch of goods needs to be loaded with 45 small trucks, and 36 trucks with large trucks. It is known that the large truck can load 4 tons more than the small truck. What is the total weight of this batch of goods?
一批货物，用小载重车运要装45辆，如果用大载重车运要装36辆，已知大车比小车每多装4吨，求这批货物的总重量？
<gadget id="calculator">1 / 36</gadget>
<output>1/36 = around 0.027778</output>

<gadget id="calculator">1 / 45</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">(1/36) - (1/45)</gadget>
<output>1/180 = around 0.005556</output>

<gadget id="calculator">4 / (1/180)</gadget>
<output>720</output>

<result>720</result>