To pave a floor with square bricks with a side length of 2 decimeters, 225 square bricks are needed. If the ground is paved with square bricks with a side length of 3 decimeters, how many bricks are needed?
用边长2分米的方砖铺一块地面，需要方砖225块．如果改用边长为3分米的方砖铺这块地面，需要多少块？
<gadget id="calculator">2 * 2 * 225</gadget>
<output>900</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">900 / 9</gadget>
<output>100</output>

<result>100</result>