My class carried out the theme activity of "Saving water, start from me". There were 20 rush-answer questions, 5 points for a correct answer, and 3 points for a wrong answer. He obviously scored 60 points. How many questions did he answer correctly?
我班开展："节约用水，从我做起"主题活动，共20道抢答题，答对一题得5分，答错一题扣3分，明明得了60分，他答对了几道题？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 - 60</gadget>
<output>40</output>

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

<gadget id="calculator">40 / 8</gadget>
<output>5</output>

<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<result>15</result>