The school astronomical observation team has 21 members, accounting for 3/40 of the whole school. How many people are there in the school? (solution with equation)
学校天文观测小组有21人，占全校人数的(3/40)．全校有多少人？(用方程解答)
<gadget id="calculator">3 / 40</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">21 / (3/40)</gadget>
<output>280</output>

<result>280</result>