A pile of 15 sticks, take away (2/5) of the pile, how many sticks are left?
一堆小棒15根，拿走这堆小棒的(2/5)，还剩多少根小棒？
<gadget id="calculator">2 / 5</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">15 * (3/5)</gadget>
<output>9</output>

<result>9</result>