A pile of candy is 200 pieces in total, of which toffee accounts for 40% of the pile of candies, and after adding more pieces of toffee, toffee accounts for 60% of the existing candies.
一堆糖果共200块，其中奶糖占这堆糖果的40%，再加入多少块奶糖后，奶糖占现有糖果60%．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</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">(3/5) / (2/5)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">200 * (3/2)</gadget>
<output>300</output>

<gadget id="calculator">300 - 200</gadget>
<output>100</output>

<result>100</result>