There is a primary school student who loves mathematics very much. He requires himself to practice 8 math problems every day within a week. I have practiced 9 questions every day from Monday to Thursday. I did not practice mathematics for the piano competition on Friday. I practiced 10 questions on Saturday. So, how many questions do I need to practice this Sunday to meet the requirements?
有位小学生特别喜爱数学，他要求自己在一周内平均每天练8道数学题．星期一至星期四每天都已练9道，星期五参加钢琴比赛没有练数学，星期六练10道题，那么，这个星期日要练多少道才达到要求？
<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">36 + 10</gadget>
<output>46</output>

<gadget id="calculator">56 - 46</gadget>
<output>10</output>

<result>10</result>