barrel of juice poured out (2/5) is exactly 200 grams. If 60% of the barrel of juice is poured out, how many grams are left.
一桶果汁倒出(2/5)正好是200克，如果倒出这桶果汁的60%，还剩多少克．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">200 / (2/5)</gadget>
<output>500</output>

<gadget id="calculator">60 / 100</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">500 * (2/5)</gadget>
<output>200</output>

<result>200</result>