Two (2, 48 students did two application questions, 8 people only got the first question right, 7 people only got the second question right, and the rest got both questions right. How many people are right.
二(2,48名同学做了二道应用题，只做对第一题的有8人，只做对第二题的有7人，剩下的是两题都做对的．两题都做对的有多少人．
<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<gadget id="calculator">48 - 15</gadget>
<output>33</output>

<result>33</result>