The school needs to build a wall with a length of 20m, a width of 2.4dm, and a height of 2m. It needs 520 bricks per cubic meter. How many bricks does the school need to buy?
学校要砌一道长20m，宽2.4dm，高2m的墙，每立方米需要砖520块，学校需要买多少块砖？
<gadget id="calculator">2.4 / 10</gadget>
<output>0.24</output>

<gadget id="calculator">20 * 0.24 * 2</gadget>
<output>9.6</output>

<gadget id="calculator">520 * 9.6</gadget>
<output>4_992</output>

<result>4_992</result>