The school is going to build a brick wall with a length of 50 meters, a thickness of 24 cm, and a height of 3 meters. If 520 bricks are used per cubic meter, how many bricks should be prepared at least?
学校准备砌一道长为50米，厚为24厘米，高为3米的砖墙，如果每立方米用砖520块，至少要准备多少块砖？
<gadget id="calculator">24 / 100</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">50 * (6/25) * 3 * 520</gadget>
<output>18_720</output>

<result>18_720</result>