The Sanitation Office has to clean up 294 tons of garbage. It has been cleaned up for 6 days, and 24 tons are cleaned up every day. How many tons are left to be cleaned up?
环卫所要清理294吨垃圾，已经清理了6天，每天清理24吨，剩下多少吨还没有清理？
<gadget id="calculator">24 * 6</gadget>
<output>144</output>

<gadget id="calculator">294 - 144</gadget>
<output>150</output>

<result>150</result>