If a house is paved with floor tiles with a side length of 50 cm, 40 pieces are needed. If the floor tiles with a side length of 25 cm are used instead, how many floor tiles are needed? (Solve using ratio method)
一间房子如果用边长是50厘米的地砖铺地，需要40块，如果改用边长是25厘米的地砖，需要多少块地砖？(用比例方法解答)
<gadget id="calculator">50 * 50 * 40</gadget>
<output>100_000</output>

<gadget id="calculator">25 * 25</gadget>
<output>625</output>

<gadget id="calculator">100_000 / 625</gadget>
<output>160</output>

<result>160</result>