The students participated in the calligraphy competition. Xiaohong wrote 50 characters, Xiaohua wrote 10 more characters than Xiaohong, and Xiaoqiang wrote twice as many characters as Xiaohua. How many more characters did Xiaoqiang write than Xiaohong?
同学们参加书法比赛，小红写了50个字，小华比小红多写10个字，小强写的字是小华的2倍，小强比小红多写了多少个字？
<gadget id="calculator">50 + 10</gadget>
<output>60</output>

<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">120 - 50</gadget>
<output>70</output>

<result>70</result>