The sixth grade students were divided into two groups, A and B, to work. The ratio of the number of people in the two groups was 7:3. Later, due to labor needs, 30 people were transferred from group A to group B, so that the ratio of the two groups became 3: 2. How many students in the sixth grade go to work?
六年级同学分成甲、乙两个组去劳动，甲、乙两组人数比是7：3，后因劳动需要，从甲组调30人到乙组，这样两组人数比变成了3：2．六年级有多少名同学去劳动？
<gadget id="calculator">7 + 3</gadget>
<output>10</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(7/10) - (3/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">30 / (1/10)</gadget>
<output>300</output>

<result>300</result>