The classrooms in schools should be paved with square bricks. To use square bricks with an area of 16 square decimeters, 495 pieces are needed. If you use square bricks with an area of 36 square decimeters instead, how many bricks are needed? (Solution with proportional knowledge)
学校电教室要用方砖铺地．用面积16平方分米的方砖，需要495块．如果改用面积是36平方分米的方砖，需要多少块？(用比例知识解)
<gadget id="calculator">16 * 495</gadget>
<output>7_920</output>

<gadget id="calculator">7_920 / 36</gadget>
<output>220</output>

<result>220</result>