It costs 100 to pave the floor with bricks with an area of 9 square decimeters. How many bricks are needed to pave the floor with square bricks with an area of 4 square decimeters? (Answer with proportional knowledge)
用面积9平方分米的砖铺地要100如果改用面积为4平方分米的方砖铺地需要多少块？(用比例知识解答)
<gadget id="calculator">9 * 100</gadget>
<output>900</output>

<gadget id="calculator">900 / 4</gadget>
<output>225</output>

<result>225</result>