A classroom is covered with 450 square bricks with an area of 16 square decimeters. If you use square bricks with a side length of 6 decimeters instead, how many bricks are needed?
一间教室，用面积16平方分米的方砖，450块正好铺满．如果改用边长是6分米的方砖，需要多少块？
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">450 / 36</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">16 * (25/2)</gadget>
<output>200</output>

<result>200</result>