A certain school holds a pitching competition. There are 20 basketball and volleyball shots. A shot is worth 5 points, and 3 points will be deducted if you miss or fail to make a shot. Xiao Ming scored 68 points. How many shots did he make?
某校举行投球比赛，投篮球和排球共二十个，投进一个球得5分，没投或投不进都要倒扣3分，小明得了68分，问他投进几个球？
<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>