The third grade students use double desks, and the desks for 90 people are placed in 3 classrooms on average. How many desks can each classroom put?
三年级同学用的是双人课桌，90人用的课桌平均放在3间教室里，每间教室可放几张？
<gadget id="calculator">90 / 2 / 3</gadget>
<output>15</output>

<result>15</result>