There are two boxes of fruit, A and B. After taking out (1/5) from box A and putting it into box B, the weight of the two boxes of fruit is equal, then the original fruit of box B is the amount of fruit in box A.
有甲、乙两箱水果，从甲箱拿出(1/5)放入乙箱后，两箱水果的重量相等，那么原来乙箱水果是甲箱水果的多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) + (1/5)</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">(3/5) / 1</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>