For a simple fraction, the numerator is 12 less than the denominator. If the numerator is decreased by 1 and the denominator is increased by 3, the new fraction is (3/5). What is the original score?
一个最简分数，分子比分母少12．如果分子减少1，分母加3，所得新分数为(3/5)．原分数是多少？
<gadget id="calculator">12 + 1 + 3</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">40 - 3</gadget>
<output>37</output>

<gadget id="calculator">25 / 37</gadget>
<output>25/37 = around 0.675676</output>

<result>25/37 = around 0.675676</result>