The cafeteria brought a batch of rice, ate all (2/3) on the first day, and the rest (2/3) on the second day, and there were still 15 kilograms 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(2/3)，第二天吃了余下的(2/3)，这时还剩下15千克．食堂运来大米多少千克？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * (2/3)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/3) - (2/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">15 / (1/9)</gadget>
<output>135</output>

<result>135</result>