The kindergarten bought 278 flower balls. After each class is divided into 38, there are 12 left. How many classes does this kindergarten have?
幼儿园买来278个花皮球，每班分38个后，还剩12个，这个幼儿园有多少个班？
<gadget id="calculator">278 - 12</gadget>
<output>266</output>

<gadget id="calculator">266 / 38</gadget>
<output>7</output>

<result>7</result>