A batch of goods, after transporting (3/5), transported in 28 tons, which is the original (3/4), how many tons did this batch of goods originally have?
一批货，运走(3/5)后，又运进28吨，这时是原来的(3/4)，这批货原来有多少吨？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">28 / (7/20)</gadget>
<output>80</output>

<result>80</result>