There are 20 questions in a math competition. For each question, 6 points will be awarded for correct answers, and 1 point will be deducted for wrong answers or failures. Xiao Bi scored 78 points in the competition, so how many questions did he get right?
一次数学竞赛，共有20道题．每一题，做对者得6分，做错或者未做者，扣一分．小毕参加竞赛得了78分，那么他做对了多少道题．
<gadget id="calculator">20 * 6</gadget>
<output>120</output>

<gadget id="calculator">120 - 78</gadget>
<output>42</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

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

<gadget id="calculator">20 - 6</gadget>
<output>14</output>

<result>14</result>