If a house needs to be paved with square bricks, 2,000 square bricks with a side length of 5 decimeters are needed. If the square bricks with a side length of 4 decimeters are used instead, how many bricks are needed? (Solve with ratio)
一间房子要用方砖铺地，用边长5分米的方砖需用2000块，如果改用边长是4分米的方砖，需用多少块？(用比例解)
<gadget id="calculator">5 * 5 * 2_000</gadget>
<output>50_000</output>

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

<gadget id="calculator">50_000 / 16</gadget>
<output>3_125</output>

<result>3_125</result>