room paved with square bricks with a side length of 0.5 meters costs 160 yuan. How many bricks are used if square bricks with a side length of 0.4 meters are used instead?
一间房间，用边长为0.5米的正方形砖铺地，要160块．如果改用边长为0.4米的正方形砖，要用多少块砖？
<gadget id="calculator">0.5 * 0.5 * 160</gadget>
<output>40</output>

<gadget id="calculator">0.4 * 0.4</gadget>
<output>0.16</output>

<gadget id="calculator">40 / 0.16</gadget>
<output>250</output>

<result>250</result>