It takes 250 pieces to pave a piece of land with square bricks with a side length of 4 decimeters. If the square bricks with a side length of 5 decimeters are used instead, how many pieces will be used? (proportional solution)
用边长4分米的方砖铺一块地，需要250块，如果改用边长5分米的方砖，要用多少块？(比例解)
<gadget id="calculator">4 * 4 * 250</gadget>
<output>4_000</output>

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

<gadget id="calculator">4_000 / 25</gadget>
<output>160</output>

<result>160</result>