There is a series of numbers, (1/1), (1/2), (2/2), (1/3), (2/3), (3/3), (1/4), (2/4 ), (3/4), (4/4)...then (5/10) is the fraction number.
有一串数，(1/1)，(1/2)，(2/2)，(1/3)，(2/3)，(3/3)，(1/4)，(2/4)，(3/4)，(4/4)…则(5/10)是第多少个分数．
<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 5</gadget>
<output>50</output>

<result>50</result>