There are 24 boys in a certain class, and the ratio of boys to girls is 2:3. The number of people in this class accounts for 1/7 of the whole school. How many people are there in the whole school?
某班有男生24人，其中男、女生人数的比是2：3，这个班人数占全校人数的(1/7)，全校有多少人？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">24 / (2/5) / (1/7)</gadget>
<output>420</output>

<result>420</result>