It takes 2,000 pieces to pave a field with square bricks with a side length of 15 cm. If the floor is paved with square bricks with a side length of 20 cm, how many pieces are needed? (Solve with ratio)
用边长15厘米的方砖铺一块地，需要2000块，如果改用边长为20厘米的方砖铺地，需要多少块？(用比例解)
<gadget id="calculator">15 * 15 * 2_000</gadget>
<output>450_000</output>

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">450_000 / 400</gadget>
<output>1_125</output>

<result>1_125</result>