If you use square bricks with a side length of 4 decimeters to pave the room, exactly 648 pieces are needed. If you use square bricks with a side length of 9 decimeters to pave the room, how many pieces are needed? (Solve with ratio)
用边长是4分米的方砖给房间铺地，正好需要648块，如果改用边长是9分米的方砖给房间铺地，需要多少块？(用比例解)
<gadget id="calculator">4 * 4 * 648</gadget>
<output>10_368</output>

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<gadget id="calculator">10_368 / 81</gadget>
<output>128</output>

<result>128</result>