What is the largest number among the five numbers (10/17), (12/19), (15/23), (20/33), (30/49).
五个数(10/17)，(12/19)，(15/23)，(20/33)，(30/49)中最大的数是多少．
<gadget id="calculator">15 / 23</gadget>
<output>15/23 = around 0.652174</output>

<result>15/23 = around 0.652174</result>