After a batch of fruit is sold (1/5), another 6 kg is sold. At this time, the ratio of the sold fruit to the remaining fruit is 1:2. How many kilograms did this batch of fruit originally weigh?
一批水果卖掉(1/5)后，又卖出6千克，这时卖出的与剩下的水果的比是1：2．这批水果原来有多少千克？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

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

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) - (1/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">6 / (2/15)</gadget>
<output>45</output>

<result>45</result>