There are 19 students who subscribe to the Journal of Mathematics, which is equivalent to (1/3) of the whole class. How many people are there in the class and what is the list
订《数学报》的同学有19人，相当于全班人数的(1/3)，全班有多少人，列式是多少
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">19 / (1/3)</gadget>
<output>57</output>

<result>57</result>