In a survey, at least one subject in Chinese and Mathematics should be selected in the Nini class. There are 45 people who like Chinese, 50 people who like mathematics, and 35 people who like both Chinese and mathematics. How many people are there in Nini class?
在一次调查中，在语文和数学中至少要选一科喜欢的妮妮班有45人喜欢语文，有50人喜欢数学，语文和数学都喜欢的有35人，妮妮班上共有多少人．
<gadget id="calculator">50 - 35</gadget>
<output>15</output>

<gadget id="calculator">45 + 15</gadget>
<output>60</output>

<result>60</result>