210 students are divided into two groups to go to the movies. The first group is divided into 4 groups, and the second group is divided into 3 groups. The number of each group is equal. How many students went to the first group?
210个同学分两批去看电影，第一批分成4个小组，第二批分成3个小组，每组人数相等，第一批去了多少个同学？
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">210 / 7</gadget>
<output>30</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<result>90</result>