A classroom needs 320 pieces of floor tiles with an area of 25 square decimeters. If you use floor tiles with an area of 16 square decimeters, how many pieces are needed? (Solve with ratio)
一间教室，用面积是25平方分米的地砖铺地，需要320块．如果用面积是16平方分米的地砖铺，需要多少块？(用比例解)
<gadget id="calculator">25 * 320</gadget>
<output>8_000</output>

<gadget id="calculator">8_000 / 16</gadget>
<output>500</output>

<result>500</result>