A fraction, if 1 is added to the numerator of the fraction, then it will be 0.25 after simplification, and if 1 is subtracted from the denominator of this fraction, then it will be 0.2 after simplification, then this fraction is: how much.
一个分数，如果这个分数的分子加上1，那么化简后为0.25，如果这个分数的分母减去1，那么化简后为0.2，那么这个分数是：多少．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<gadget id="calculator">3 / 16</gadget>
<output>3/16 = around 0.1875</output>

<result>3/16 = around 0.1875</result>