A fish pond is 15 meters long, 10 meters wide, and 2.5 meters deep. Put cement on all sides of the fish pond to prevent water seepage. If an average of 12 kilograms of cement is used per square meter. How many kilograms of cement are needed in total?
一个养鱼池长15米，宽10米，深2.5在鱼池的各个面上抹水泥防止渗水，如果平均每平方米用水泥12千克．共需要水泥多少千克？
<gadget id="calculator">15 * 2.5</gadget>
<output>37.5</output>

<gadget id="calculator">10 * 2.5</gadget>
<output>25</output>

<gadget id="calculator">37.5 + 25</gadget>
<output>62.5</output>

<gadget id="calculator">62.5 * 2</gadget>
<output>125</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">125 + 150</gadget>
<output>275</output>

<gadget id="calculator">12 * 275</gadget>
<output>3_300</output>

<result>3_300</result>