A piece of land with a length of 25 meters and a width of 21 meters. How many square bricks are needed to pave the floor with an area of 5 square meters?
一块长为长25米，宽21米的地．用面积为5平方米的方砖铺地，需要多少块？
<gadget id="calculator">21 / 5</gadget>
<output>21/5 = around 4.2</output>

<gadget id="calculator">25 * (21/5)</gadget>
<output>105</output>

<result>105</result>