There are 20 questions in a math competition, 5 points are awarded for each correct answer, and 3 points are deducted for each wrong answer. Liu Qiang scored 68 points in the test, how many questions did Liu Qiang get right.
一次数学竞赛共20道题，做对一题得5分，做错一题扣3分．刘强考了68分，刘强做对了多少道题．
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 - 68</gadget>
<output>32</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">32 / 8</gadget>
<output>4</output>

<gadget id="calculator">20 - 4</gadget>
<output>16</output>

<result>16</result>