A room is paved with square bricks with an area of 0.3 square meters, and a total of 250 bricks are used. If the floor is paved with square bricks with a side length of 0.5 meters, how many bricks will be used?
一个房间用面积是0.3平方米的方砖铺地，共用250块，如果改用边长是0.5米的方砖铺地，要用多少块？
<gadget id="calculator">0.3 * 250</gadget>
<output>75</output>

<gadget id="calculator">0.5 * 0.5</gadget>
<output>0.25</output>

<gadget id="calculator">75 / 0.25</gadget>
<output>300</output>

<result>300</result>