If a house is paved with bricks with a side length of 3dm, it needs 400 yuan; if it is replaced with bricks with a side length of 6dm, how many bricks are needed?
一间房子，如果用边长3dm的砖铺地，需要400块；如果改用边长6dm的砖铺地，需要多少块？
<gadget id="calculator">3 * 3 * 400</gadget>
<output>3_600</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">3_600 / 36</gadget>
<output>100</output>

<result>100</result>