Let B be the number of cups of boiling water that we should mix with I cups of ice to get 3 cups of 110°F water.
Therefore, we can set the following equation:

Subtracting B from the first equation we get:

Substituting the above equation in the second one we get:

Simplifying the above result we get:

Subtracting 96 to the above equation we get:

Dividing the above equation by 188 we get:

Substituting B=1.24 at I=3-B we get:

Answer:
