There are 50 students in a certain class. In a monthly exam, 26 students scored above 90 in Chinese, 32 students scored above 90 in mathematics, and 20 students scored above 90 in both subjects. How many people do not score 90 in both subjects?
某班有50名学生，在一次月底考试中，语文上90分以上的26人，数学90分以上的32人，两科都上90分的20人．两科都不上90分的有多少人
<gadget id="calculator">32 - 20</gadget>
<output>12</output>

<gadget id="calculator">26 + 12</gadget>
<output>38</output>

<gadget id="calculator">50 - 38</gadget>
<output>12</output>

<result>12</result>