There are 15 chickens in two cages. If 4 chickens are put into cage A and 2 chickens are taken out from cage B, there will be 1 more chicken in cage B. How many chickens were there in the two cages of B?
两个鸡笼共有鸡15只，如果甲笼里新放入4只，乙笼里取出2只，这时乙笼的鸡多1只．乙两笼里原来有多少只鸡．
<gadget id="calculator">4 + 2 + 1</gadget>
<output>7</output>

<gadget id="calculator">15 + 7</gadget>
<output>22</output>

<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<result>11</result>