Groups A, B, and C have a total of 90 books. Group B borrowed 3 books from Group A and gave 5 books to Group C. As a result, the three groups had the same number of books. How many books did A have?
甲乙丙三组共有图书90本，乙组向甲组借3本后，又送给丙5本，结果三个组图书一样多，甲原来有图书多少本？
<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<gadget id="calculator">30 + 3</gadget>
<output>33</output>

<result>33</result>