A swimming pool is 50 meters long, 30 meters wide, and 1.5 meters deep. The walls and bottom of the pool are covered with cement. If 15 kilograms of cement is needed per square meter, how many tons of cement are needed in total?
一个游泳池长50米，宽30米，深1.5米，在池子的四壁和底部抹上水泥，如果每平方米需要水泥15千克，那么一共需要多少吨水泥？
<gadget id="calculator">50 * 30</gadget>
<output>1_500</output>

<gadget id="calculator">30 * 1.5</gadget>
<output>45</output>

<gadget id="calculator">1.5 * 50</gadget>
<output>75</output>

<gadget id="calculator">1_500 + 45 + 75</gadget>
<output>1_620</output>

<gadget id="calculator">1_620 * 2</gadget>
<output>3_240</output>

<gadget id="calculator">3_240 - 1_500</gadget>
<output>1_740</output>

<gadget id="calculator">15 / 1_000</gadget>
<output>3/200 = around 0.015</output>

<gadget id="calculator">1_740 * (3/200)</gadget>
<output>261/10 = around 26.1</output>

<result>261/10 = around 26.1</result>