There are 21 boys in the chorus, which is less than girls (1/4). How many people are there in the chorus?
合唱队里有男生21人，比女生少(1/4)，合唱队共有多少人．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">21 / (3/4)</gadget>
<output>28</output>

<gadget id="calculator">28 + 21</gadget>
<output>49</output>

<result>49</result>