The ratio of the number of cocks to the number of hens in the chicken farm is 6:5. When 660 cocks are sold, the ratio of the number of roosters to the number of hens is 5:6. How many chickens are there in the chicken farm now? ?
养鸡场公鸡只数与母鸡只数之比是6：5，当公鸡卖出660只后，公鸡只数与母鸡只数之比是5：6，现在养鸡场还有多少只鸡？
<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(6/5) - (5/6)</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">660 / (11/30)</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 / 6</gadget>
<output>300</output>

<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">300 * 11</gadget>
<output>3_300</output>

<result>3_300</result>