Tim is participating in the following three math contests.  On each contest his score is the number of correct answers.
    $\bullet$ The Local Area Inspirational Math Exam consists of 15 problems.
    $\bullet$ The Further Away Regional Math League has 10 problems.
    $\bullet$ The Distance-Optimized Math Open has 50 problems.
For every positive integer $n$, Tim knows the answer to the $n$th problems on each contest (which are pairwise distinct), if they exist; however, these answers have been randomly permuted so that he does not know which answer corresponds to which contest.  Unaware of the shuffling, he competes with his modified answers.  Compute the expected value of the sum of his scores on all three contests.

[i]Proposed by Evan Chen[/i]
1. **Understanding the Problem:**
   Tim participates in three math contests with different numbers of problems:
   - Local Area Inspirational Math Exam (LAIMO): 15 problems
   - Further Away Regional Math League (FARML): 10 problems
   - Distance-Optimized Math Open (DOMO): 50 problems

   Tim knows the answers to the \( n \)-th problems of each contest, but the answers are randomly permuted. We need to compute the expected value of the sum of his scores on all three contests.

2. **Expected Correct Answers for Each Contest:**
   Since the answers are randomly permuted, for each problem in any contest, the probability that Tim's answer is correct is \(\frac{1}{3}\). This is because there are three possible contests for each answer, and only one of them is correct.

3. **Expected Correct Answers for Each Contest:**
   - For LAIMO (15 problems):
     \[
     \text{Expected correct answers} = 15 \times \frac{1}{3} = 5
     \]
   - For FARML (10 problems):
     \[
     \text{Expected correct answers} = 10 \times \frac{1}{3} = 3.\overline{3}
     \]
   - For DOMO (50 problems):
     \[
     \text{Expected correct answers} = 50 \times \frac{1}{3} = 16.\overline{6}
     \]

4. **Summing the Expected Values:**
   The total expected value of the sum of his scores on all three contests is the sum of the expected correct answers for each contest:
   \[
   5 + 3.\overline{3} + 16.\overline{6} = 5 + \frac{10}{3} + \frac{50}{3} = 5 + \frac{60}{3} = 5 + 20 = 25
   \]

The final answer is \(\boxed{25}\).