In a competition, it is stipulated that 10 points will be added for a correct answer, and 5 points will be deducted for a wrong answer. Xiao Li answered 20 questions and got 140 points. How many questions did he get right?
在一次竞赛中规定：答对一道就加10分，答错一道要倒扣5分．小李答了20道题，结果得了140分，他答对了几道题？
<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">200 - 140</gadget>
<output>60</output>

<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">60 / 15</gadget>
<output>4</output>

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

<result>16</result>