In the fruit wholesale market, (7/10) tons of fruits are shipped, including (2/5) tons of apples, (1/4) tons of pears, and the rest are bananas. How many tons are there in bananas?
水果批发市场，运来水果(7/10)吨，其中苹果有(2/5)吨，梨有(1/4)吨，其余的是香蕉，香蕉有多少吨？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(7/10) - (2/5) - (1/4)</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>