To pave the floor of a conference room, it was originally planned to use square bricks with a side length of 4 decimeters, which required 900 pieces. Now use square bricks whose area is 20 square decimeters larger than the original, how many bricks are needed? (Solve with ratio)
给一间会议室铺地，原计划用边长4分米的方砖，需要900块．现改用每块面积比原来大20平方分米的方砖，需要多少块？(用比例解)
<gadget id="calculator">900 * 4 * 4</gadget>
<output>14_400</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">16 + 20</gadget>
<output>36</output>

<gadget id="calculator">14_400 / 36</gadget>
<output>400</output>

<result>400</result>