pool is 15 meters long, 8 meters wide and 2 meters deep. How many pieces of square tiles with a side length of 5 decimeters are built around and on the bottom of the pool?
一个水池长15米，宽8米，深2米．在这个水池的四周和底面砌上边长是5分米的正方形瓷砖，共要多少块？
<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<gadget id="calculator">15 * 2 * 2</gadget>
<output>60</output>

<gadget id="calculator">8 * 2 * 2</gadget>
<output>32</output>

<gadget id="calculator">120 + 60 + 32</gadget>
<output>212</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">5 * (1/20)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">212 / (1/4)</gadget>
<output>848</output>

<result>848</result>