A fraction can be simplified to (1/2) by adding 3 to the denominator; it can be simplified to (5/9) by subtracting 5 from the denominator. What is this score?
一个分数，分母加上3，可化简为(1/2)；分母减去5，可化简为(5/9)．这个分数是多少？
<gadget id="calculator">2 * 40</gadget>
<output>80</output>

<gadget id="calculator">80 - 3</gadget>
<output>77</output>

<gadget id="calculator">40 / 77</gadget>
<output>40/77 = around 0.519481</output>

<result>40/77 = around 0.519481</result>