After a batch of fruit is sold (3/4), another 180 kg is purchased, and the current fruit is less than the original one (7/20). How many kilograms of fruit does it have?
将一批水果卖出(3/4)后，又购进180千克，现在的水果比原来的少(7/20)．原来有水果多少千克？
<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

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

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (7/20) - (1/4)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">180 / (2/5)</gadget>
<output>450</output>

<result>450</result>