There are 300 students in the upper grade, the middle grade is the upper grade (7/10), and the lower grade (7/6). How many students are there in the lower grade?
高年级有300人，中年级是高年级的(7/10)，是低年级的(7/6)，低年级有学生多少人？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">7 / 6</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">(7/10) / (7/6)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">300 * (3/5)</gadget>
<output>180</output>

<result>180</result>