A primary school beautifies the environment and uses colored cement bricks to pave the road. It costs 3,600 yuan to use square bricks with an area of 4 square decimeters. How many pieces will it cost to use square bricks with an area of 9 square decimeters? (Solution by proportional method)
某小学美化环境，用彩色水泥砖铺路面，用面积4平方分米的方砖铺要3600块，若改用面积9平方分米的方砖铺要几块？(用比例方法解)
<gadget id="calculator">4 * 3_600</gadget>
<output>14_400</output>

<gadget id="calculator">14_400 / 9</gadget>
<output>1_600</output>

<result>1_600</result>