The mother mouse bought a bottle of butter weighing 550 grams. After being eaten by the little mouse, there were 280 grams left. How many grams did the little mouse steal?
鼠妈妈买了一瓶重550克的黄油，被小老鼠吃掉一些后，还剩280克，小老鼠偷吃了多少克．
<gadget id="calculator">550 - 280</gadget>
<output>270</output>

<result>270</result>