Build a wall with a length of 20 meters, a width of 2.5 meters, and a height of 0.4 meters. Use 5 kilograms of lime per square meter. Ask: How many kilograms of lime will be used in total?
砌一堵墙，长20米，宽2.5米，高0.4米，每平方米用石灰5千克，问：一共要用多少千克石灰？
<gadget id="calculator">20 * 2.5</gadget>
<output>50</output>

<gadget id="calculator">20 * 0.4</gadget>
<output>8</output>

<gadget id="calculator">2.5 * 0.4</gadget>
<output>1</output>

<gadget id="calculator">50 + 8 + 1</gadget>
<output>59</output>

<gadget id="calculator">59 * 2</gadget>
<output>118</output>

<gadget id="calculator">118 - 50</gadget>
<output>68</output>

<gadget id="calculator">68 * 5</gadget>
<output>340</output>

<result>340</result>