A fraction is reduced to (3/7), and if the denominator is added with 10, it can be reduced to (3/8). What is the original score.
一个分数约简后是(3/7)，若分母加上10可以约简成(3/8)．原分数是多少．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">70 / 70</gadget>
<output>1</output>

<gadget id="calculator">(3/7) * 1</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>