The ratio of the number of people in the dance group to the chorus group is 5:9, how much more people in the chorus group than in the dance group
舞蹈组和合唱组人数的比是5：9，合唱组的人数比舞蹈组多多少
<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>