To pave a house, it takes 600 square bricks with an area of 0.3m**2; if it uses square bricks with an area of 0.4m**2, how many bricks are needed?
给一间房屋铺地，用面积是0.3米**2的方砖，需要600块；如果用面积是0.4米**2方砖，需要多少块？
<gadget id="calculator">0.3 / 0.4</gadget>
<output>0.75</output>

<gadget id="calculator">600 * 0.75</gadget>
<output>450</output>

<result>450</result>