If a house needs to be paved with square bricks, 500 pieces are needed if the square bricks with a side length of 4 decimeters are used. If the square bricks with a side length of 5 decimeters are used instead, how many pieces are needed? (Solve with ratio)
一间房子要用方砖铺地，用边长4分米的方砖，需用500块，如果改用边长是5分米的方砖，需用多少块？(用比例解)
<gadget id="calculator">4 * 4 * 500</gadget>
<output>8_000</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">8_000 / 25</gadget>
<output>320</output>

<result>320</result>