The floor of a square needs to be paved with square bricks. The original plan was to use square bricks with a side length of 6 decimeters, which required 400 pieces. Later, the floor was replaced with square bricks with an area of 64 square decimeters. How many pieces were needed? (Solve with ratio)
有一个广场的地面要铺方砖，原计划用边长为6分米的方砖铺，需要400块；后来改用面积是64平方分米方砖铺地，需要多少块？(用比例解)
<gadget id="calculator">6 * 6 * 400</gadget>
<output>14_400</output>

<gadget id="calculator">14_400 / 64</gadget>
<output>225</output>

<result>225</result>