There are 18 white chickens, and there are 2 more black chickens than white chickens. What is the number of white chickens compared to black chickens?
白鸡有18只，黑鸡比白鸡多2只，白鸡的只数是黑鸡的多少
<gadget id="calculator">18 + 2</gadget>
<output>20</output>

<gadget id="calculator">18 / 20</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>