The cafeteria brought a batch of rice, and ate all (2/5) on the first day, the rest (1/3) on the second day, and the rest (3/4) on the third day. There are 15 kg left. How many kilograms of rice is shipped from the canteen?
食堂运来一批大米，第一天吃了全部的(2/5)，第二天吃了余下的(1/3)，第三天吃了这时余下的(3/4)，这时还剩下15千克．食堂运来大米多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/5) * (1/3)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (2/5) - (1/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(2/5) * (3/4)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (2/5) - (1/5) - (3/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">15 / (1/10)</gadget>
<output>150</output>

<result>150</result>