There are 35 boys in the fourth grade, and the number of boys accounts for 70% of the whole class. How many students are there in the fourth grade?
四年级有男生35人，男生人数占全班人数的70%，四年级共有多少人？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">35 / (7/10)</gadget>
<output>50</output>

<result>50</result>