There are 48 people in Class 1 of the third grade, 32 people got A in Chinese, 27 people got A in Mathematics, all of them got A in at least one subject, how many people got A in both Chinese and Mathematics?
三年级1班有48人，语文得优的有32人，数学得优的有27人，所有人至少有一科得优，语文和数学都是优的有多少人？
<gadget id="calculator">27 - 48</gadget>
<output>-21</output>

<gadget id="calculator">32 + (-21)</gadget>
<output>11</output>

<result>11</result>