To lay floor tiles for a house, if you choose square bricks of 16 square decimeters, you need 540 pieces. If you choose square bricks of 36 square decimeters, how many pieces are needed?
给一间房子铺地砖，如果选用16平方分米的正方形方砖，需要540块，如果选用36平方分米的方砖，需要多少块？
<gadget id="calculator">540 / 36</gadget>
<output>15</output>

<gadget id="calculator">16 * 15</gadget>
<output>240</output>

<result>240</result>