There are 48 people in our class, among them (1/4) participate in basketball, (1/3) participate in football, and the rest participate in chess. How many people participate in chess activities?
我们班有48人，参加篮球的有(1/4)，参加足球的有(1/3)，剩下的参加棋类，参加棋类活动的有多少人？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/4) - (1/3)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">48 * (5/12)</gadget>
<output>20</output>

<result>20</result>