How many ways are there to rearrange the letters of the word RAVEN such that no two vowels are consecutive?

[i]2015 CCA Math Bonanza Team Round #2[/i]
1. **Calculate the total number of arrangements of the letters in "RAVEN":**
   The word "RAVEN" consists of 5 distinct letters. The total number of ways to arrange these letters is given by the factorial of the number of letters:
   \[
   5! = 120
   \]

2. **Calculate the number of arrangements where the vowels (A and E) are consecutive:**
   - Treat the pair of vowels AE as a single "block". This reduces the problem to arranging 4 "letters" (the block AE, and the consonants R, V, N).
   - The number of ways to arrange these 4 "letters" is:
     \[
     4! = 24
     \]
   - Within the block AE, the vowels can be arranged in 2 ways (AE or EA):
     \[
     2! = 2
     \]
   - Therefore, the total number of arrangements where A and E are consecutive is:
     \[
     4! \times 2! = 24 \times 2 = 48
     \]

3. **Calculate the number of arrangements where no two vowels are consecutive:**
   - Subtract the number of arrangements where A and E are consecutive from the total number of arrangements:
     \[
     120 - 48 = 72
     \]

Conclusion:
The number of ways to arrange the letters of the word "RAVEN" such that no two vowels are consecutive is:
\[
\boxed{72}
\]