A bag of fish and water is 4.125 catties in total. After pouring out (1/4) of the water, there will be 3.125 catties left. How many catties does the fish weigh? (The weight of the plastic bag is not included)
一袋鱼和水共4.125斤，将水倒出(1/4)后，还剩3.125斤，鱼有多少斤．(塑料袋重量不计)
<gadget id="calculator">4.125 - 3.125</gadget>
<output>1</output>

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

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

<gadget id="calculator">4.125 - 4</gadget>
<output>0.125</output>

<result>0.125</result>