There are 4 groups in Class 51. There are 19 people in groups 1 and 2, and 35 people in groups 2, 3, and 4. It is known that the number of people in the second group accounts for 1/5 of the whole class. How many people are there in the class?
五1班有4个小组，一、二两个小组共有19人，二、三、四、小组共有35人，已知第二小组的人数占全班的(1/5)．全班有多少人？
<gadget id="calculator">19 + 35</gadget>
<output>54</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">54 / (6/5)</gadget>
<output>45</output>

<result>45</result>