One pack of tea leaves is used up (3/5), and there are 600 grams left. How much does this pack of tea leaves weigh?
一包茶叶用去(3/5)，还剩下600克，这包茶叶有多重？
<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">600 / (2/5)</gadget>
<output>1_500</output>

<result>1_500</result>