The sum of the numerator and denominator of a fraction is 45. If 15 is added to the numerator and denominator at the same time, (2/3) is obtained after dividing. What was the original score?
一个分数分子与分母的和是45，如果分子、分母同时加上15，再约分后得(2/3)．原来的分数是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 15</gadget>
<output>10</output>

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">45 + 5</gadget>
<output>50</output>

<gadget id="calculator">1 + (2/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">50 / (5/3)</gadget>
<output>30</output>

<gadget id="calculator">45 - 30</gadget>
<output>15</output>

<gadget id="calculator">15 / 30</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>