Huanhuan subtracts the same number from the numerator and denominator of the fraction (97/181) at the same time to get a new fraction, and then divides the new fraction to get (2/5). You know the number subtracted by Huanhuan How much is it? How did you arrive at this answer? Please describe your thought process.
欢欢把分数(97/181)的分子和分母同时减去同一个数后，得到一个新的分数，再把这个新分数约分后得到(2/5)，你知道欢欢减去的数是几吗？你是怎么得到这个答案的，请写出你的思考过程．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 181</gadget>
<output>362/5 = around 72.4</output>

<gadget id="calculator">97 - (362/5)</gadget>
<output>123/5 = around 24.6</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(123/5) / (3/5)</gadget>
<output>41</output>

<result>41</result>