Answer process:

1+6=7,

After drinking half a cup (1/2), the sugar content is:1/7×1/2 =114; Water ratio: 6/7× 1/2=3/7.

After refilling with water, the water ratio is 3/7+1/2 =13/14.

So, at this time, the ratio of sugar to water in the cup is:

1/ 14: 13/ 14= 1: 13