Xiaoming’s living room needs to be paved with floor tiles. It takes 50 pieces of floor tiles with a side length of 0.3 meters. If you choose a side length of 0.5 meters, how many pieces do you need? (Solve with ratio)
小明家的客厅要铺地砖，选择边长0.3米的地砖需50块，如果选择边长0.5米的地砖需多少块？(用比例解)
<gadget id="calculator">0.3 * 0.3 * 50</gadget>
<output>4.5</output>

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

<gadget id="calculator">4.5 / 0.25</gadget>
<output>18</output>

<result>18</result>