A batch of goods was transported away by truck (3/7), and 25% of all the goods were transported by tricycle, leaving 18 tons not transported away. How many tons of original goods?
一批货物，用卡车运走了(3/7)，又用三轮车运走了全部货物的25%，还剩下18吨没有运走．原有货物多少吨？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/7) + (1/4)</gadget>
<output>19/28 = around 0.678571</output>

<gadget id="calculator">1 - (19/28)</gadget>
<output>9/28 = around 0.321429</output>

<gadget id="calculator">18 / (9/28)</gadget>
<output>56</output>

<result>56</result>