The teacher assigned 20 calculation problems, Xiao Ming has already done (2/5), Xiao Hong has done the quantity (3/4), who has done more? How much more?
老师布置了20道计算题，小明已经做了(2/5)，小红已经做了量(3/4)，谁做得多？多多少道？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">20 * (3/4)</gadget>
<output>15</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * (2/5)</gadget>
<output>8</output>

<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<result>7</result>