a true score. Its numerator and denominator are consecutive natural numbers. If we subtract 4 from the numerator, we get (3/4). What is the true score.
一个真分数．它的分子、分母是连续的自然数．如果将分子减去4，约分后得(3/4)．这个真分数是多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4 + (3/4)</gadget>
<output>19/4 = around 4.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(19/4) / (1/4)</gadget>
<output>19</output>

<gadget id="calculator">19 + 1</gadget>
<output>20</output>

<gadget id="calculator">(19/4) / (1/4) / 20</gadget>
<output>19/20 = around 0.95</output>

<result>19/20 = around 0.95</result>