There are 48 students in a certain class, 25 students can play basketball, 18 students can play volleyball, and 12 students can neither. How many people can play both basketball and volleyball?
某班有48人，会打篮球的有25人，会打排球的有18人，都不会的有12人．既会打篮球又会打排球的有多少人．
<gadget id="calculator">25 + 18</gadget>
<output>43</output>

<gadget id="calculator">48 - 12</gadget>
<output>36</output>

<gadget id="calculator">43 - 36</gadget>
<output>7</output>

<result>7</result>