The same number is subtracted from the numerator and denominator of the fraction (97/181), and the new fraction is (2/5), then what is the subtracted number.
分数(97/181)的分子和分母都减去同一个数，新的分数约分后是(2/5)，那么减去的数是多少．
<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>