There are two chicken farms, the first chicken farm has 1500 chickens, and the second chicken farm has 1200 chickens. How many chickens are transferred from the first chicken farm to the second chicken farm? number equal?
两个养鸡场，第一养鸡场有1500只，第二养鸡场有1200只，从第一养鸡场调多少只鸡到第二养鸡场后，两个养鸡场鸡的只数相等？
<gadget id="calculator">1_500 - 1_200</gadget>
<output>300</output>

<gadget id="calculator">300 / 2</gadget>
<output>150</output>

<result>150</result>