For a fraction, the sum of its numerator and denominator is 73. Add 5 to the numerator and 12 to the denominator. The new fraction has the same size as (1/2). What is the original score?
一个分数，它的分子与分母之和是73，分子加上5，分母加上12，新的分数与(1/2)的大小一样．原分数是多少？
<gadget id="calculator">73 + 5 + 12</gadget>
<output>90</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">90 * (1/3)</gadget>
<output>30</output>

<gadget id="calculator">30 - 5</gadget>
<output>25</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">90 * (2/3)</gadget>
<output>60</output>

<gadget id="calculator">60 - 12</gadget>
<output>48</output>

<gadget id="calculator">25 / 48</gadget>
<output>25/48 = around 0.520833</output>

<result>25/48 = around 0.520833</result>