The school chorus team has 40 members, the dance team belongs to the chorus team (2/5), the calligraphy and painting group consists of dance team members (1/4), how many people are there in the calligraphy and painting group?
学校合唱队40人，舞蹈队是合唱队的(2/5)，书画小组的人数是舞蹈队的(1/4)，书画小组有多少人？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 * (2/5) * (1/4)</gadget>
<output>4</output>

<result>4</result>