In a 10-minute knowledge competition, Xiao Ming can do 15 questions per minute, but he does 3 wrong ones, and he has to rest for 1 minute after doing 2 minutes, so how many questions did Xiao Ming get right in this competition.
一次10分钟的知识竞赛，小明每分钟能做15道题，但做3道错一道，而且他做2分钟要休息1分钟，那么小明这次竞赛做对了多少道题．
<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">15 * 7 * (2/3)</gadget>
<output>70</output>

<result>70</result>