The number of hens in the chicken farm is 6 times that of roosters. Later, the number of roosters and hens is increased by 60 each. As a result, the number of hens is 4 times that of roosters. How many chickens did the chicken farm raise in total?
养鸡场的母鸡只数是公鸡的6倍，后来公鸡和母鸡各增加60只，结果母鸡的只数就是公鸡的4倍．原来养鸡场一共养了多少只鸡？
<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">240 - 60</gadget>
<output>180</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">180 / 2</gadget>
<output>90</output>

<gadget id="calculator">6 * 90</gadget>
<output>540</output>

<gadget id="calculator">90 + 540</gadget>
<output>630</output>

<result>630</result>