The chorus team of Yongsheng Primary School has 21 people, which is 3/7 of the swimming team. How many people are there in the swimming team?
永升小学的合唱队有21人，是游泳队人数的(3/7)，游泳队有多少人？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">21 / (3/7)</gadget>
<output>49</output>

<result>49</result>