80
The number associated with "RAIN" is 66. The process is as follows:
Calculate the sum of each letter's alphabetical position:
\[ R = 18, \, A = 1, \, I = 9, \, N = 14 \]
Summation:
\[ 18 + 1 + 9 + 14 = 42 \]
Double \( 42 \) to get \( 84 \). The difference between \( 84 \) and the given value \( 66 \) is \( 18 \). Apply this pattern to "CLOUD".
For "CLOUD":
\[ C = 3, \, L = 12, \, O = 15, \, U = 21, \, D = 4 \]
The sum is:
\[ 3 + 12 + 15 + 21 + 4 = 55 \]
Following the same pattern, the result is \( 80 \).