Aunt Wang's family raised 172 roosters and 128 hens, and sold 155 chickens. How many chickens are left?
王大妈家养了172只公鸡，128只母鸡，卖掉155只鸡，还剩多少只鸡？
<gadget id="calculator">128 - 155</gadget>
<output>-27</output>

<gadget id="calculator">172 + (-27)</gadget>
<output>145</output>

<result>145</result>