A fraction is estimated once with 2, twice with 3, once with 5, and finally it is five-sevenths. What is the original score?
一个分数用2约了一次，用3约了两次，用5约了一次，最后是七分之五，原来的分数是多少．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>