The community needs to build a wall with a length of 20 meters, a width of 20 centimeters and a height of 2.5 meters. The volume of each brick is 2 cubic decimeters, at least how many bricks are needed?
小区要砌一道长20米，宽20厘米，高2.5米的墙．每块砖体积是2立方分米，至少需要多少块砖？
<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">20 * 10 * 2 * 2.5 * 5</gadget>
<output>5_000</output>

<result>5_000</result>