The number of hens in a chicken farm is 6 times the number of roosters. Later, the number of roosters and hens is increased by 60 each, and the number of hens becomes 4 times the number of roosters. Then how many chickens were raised in the chicken farm?
某养鸡场的母鸡只数是公鸡只数的6倍，后来公鸡、母鸡各增加60只，母鸡的只数变成公鸡只数的4倍．则养鸡场原来一共养了多少只鸡．
<gadget id="calculator">4 * 60</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">90 * 6</gadget>
<output>540</output>

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

<result>630</result>