In (5/6), (4/9), (10/15), (7/12), what number is equal to (2/3).
在(5/6)，(4/9)，(10/15)，(7/12)中，与(2/3)相等的数是多少．
<gadget id="calculator">10 / 15</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>