The length of a swimming pool is 30 meters, the width is 15 meters, and the depth of the pool is 2.5 meters. Now tiles should be pasted around and on the bottom of the swimming pool. If the side length of a square tile is 2 decimeters, then at least such tiles are needed How many bricks?
一个游泳池的长是30米，宽是15米，池深是2.5米，现在要在这个游泳池的四周和底面贴磁砖，如果正方形磁砖的边长是2分米，那么至少需要这样的磁砖多少块？
<gadget id="calculator">30 * 15</gadget>
<output>450</output>

<gadget id="calculator">15 * 2.5</gadget>
<output>37.5</output>

<gadget id="calculator">2.5 * 30</gadget>
<output>75</output>

<gadget id="calculator">450 + 37.5 + 75</gadget>
<output>562.5</output>

<gadget id="calculator">562.5 * 2</gadget>
<output>1_125</output>

<gadget id="calculator">1_125 - 450</gadget>
<output>675</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * (1/5)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">675 / (1/25)</gadget>
<output>16_875</output>

<result>16_875</result>