After selling the original fruit (2/5), buy another 120 kg. The current fruit is less than the original (4/15), how many kilograms of the original fruit?
将原有的水果卖出(2/5)后，又购进120千克．现在的水果比原来还少(4/15)，原有水果多少千克？
<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<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 - (4/15) - (3/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">120 / (2/15)</gadget>
<output>900</output>

<result>900</result>