Wang Hui typed 28 characters per minute on average, Chen Hua typed three times faster than Wang Hui, how many more characters per minute did Chen Hua type on average?
王辉平均每分打28个字，陈华打字的速度是王辉的3倍，陈华平均每分多打多少个字．
<gadget id="calculator">28 * 3</gadget>
<output>84</output>

<gadget id="calculator">84 - 28</gadget>
<output>56</output>

<result>56</result>