In an environmental protection knowledge competition in the school, there were 20 questions in total, 10 points were awarded for each correct answer, and 5 points were deducted for each incorrect answer. The final score of the Blue Sky team was 155 points, so how many questions did the team answer correctly?
在学校一次环境保护知识抢答比赛中，共有20道题，每答对一道题得10分，答错一道倒扣5分，蓝天队最后得分是155分，那么该队共答对多少题．
<gadget id="calculator">200 - 155</gadget>
<output>45</output>

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

<gadget id="calculator">45 / 15</gadget>
<output>3</output>

<gadget id="calculator">20 - 3</gadget>
<output>17</output>

<result>17</result>