For a project, 120 pieces are completed every day, and 2/3 of the whole project remains after 4 days. How many pieces are there in this project?
一项工程，每天完成120件，4天后还剩下全工程的(2/3)，这项工程原来有多少件？
<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">4 / (1/3)</gadget>
<output>12</output>

<gadget id="calculator">120 * 12</gadget>
<output>1_440</output>

<result>1_440</result>