The number of boys in the school chorus team originally accounted for 1/3 of the total number of chorus teams, and later 5 boys joined, so boys accounted for 2/5 of the total number of chorus teams now. How many boys do you think there are in the chorus now?
学校合唱队男生人数原来占合唱队总人数(1/3)，后来又有5名男生加入，这样男生就占现在合唱队总人数的(2/5)．你认为现在合唱队有男生多少名？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/5) / (3/5)</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(1/3) / (2/3)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">5 / (1/6)</gadget>
<output>30</output>

<gadget id="calculator">30 * (2/3)</gadget>
<output>20</output>

<result>20</result>