Xiaoming wrote 36 big characters, which were written by Xiaolan (2/3) and Xiaohong (6/7). How many more big characters did Xiaolan write than Xiaohong?
小明写大字36个，是小兰写的(2/3)，也是小红写的(6/7)，小兰比小红多写几个大字？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">36 / (2/3)</gadget>
<output>54</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">36 / (6/7)</gadget>
<output>42</output>

<gadget id="calculator">54 - 42</gadget>
<output>12</output>

<result>12</result>