Answer:
If the sum of the balls is a factor of 30, eat at Joe's Place. If the sum is not a factor of 30, eat at Taco Towne.
Explanation:
By listing out all the probabilities you can get by drawing the balls, the answer is so because you have an equal number of sums that are factors of 30 and sums that are factors of less than 30.
(To have it fair, both criteria need to have the same probability.)
The probabilities you have are
: 1,2
: 1,4
: 1,7
: 1,8
: 2,4
: 2,7
: 2,8
: 4,7
: 4,8
: 7,8