The students wiped the doors and windows. Each classroom has 4 windows. There are 24 classrooms in the teaching building, and 38 windows were wiped. How many windows are left.
同学们擦门窗，每间教室有4扇窗户，教学楼上共有24个教室，擦了38扇，还剩多少扇窗子没擦．
<gadget id="calculator">24 * 4</gadget>
<output>96</output>

<gadget id="calculator">96 - 38</gadget>
<output>58</output>

<result>58</result>