Uncle Li caught a big fish, Xiaoling asked: "How much does this fish weigh?" Uncle Li replied: "Add (4/5) kilograms to (4/5) of this fish, that is the weight of the fish. "How much does this fish weigh?
李叔叔捕到一条大鱼，小玲问："这条鱼有多重？"李叔叔回答说："(4/5)千克再加上这条鱼的(4/5)，就是鱼的重量．"请问这条鱼有多重？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(4/5) / (1/5)</gadget>
<output>4</output>

<result>4</result>