There are 7 classrooms on each floor of the school's new teaching building, and each classroom should be equipped with 25 sets of double desks and chairs. How many sets of desks and chairs does the school need to purchase in total?
学校新教学楼每层有7间教室，每间教室要配25套双人课桌椅．学校一共需要购进多少套课桌椅？
<gadget id="calculator">25 * 7</gadget>
<output>175</output>

<result>175</result>