Class 31 students donated extracurricular books to "Hope Primary School". There were 4 people in the first group, and each person donated 12 extra-curricular books. The second group has 5 people and donated 35 extra-curricular books in total. How many extracurricular books did the two groups of students donate?
三1班同学为"希望小学"捐课外书．第一小组有4人，每人捐了12本课外书．第二小组有5人，共捐了35本课外书．两组同学一共捐了多少本课外书？
<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">48 + 35</gadget>
<output>83</output>

<result>83</result>