Answer- You can get 10 Small rafts
12 x 100+ 1200
1600-1200=400
400/40 =10 Rafts
The answer I got is = .0688888889
If the first letter is a vowel, there are 6*26 = 156 possibilities.
If the second letter is a vowel, there are 26*6 = 156 possibilities.
The sum of these numbers is 2*156 = 312, but that counts double-vowel words twice. There are 36 of those.
The number of possible unique 2-letter pairs is 312 - 36 = 276.
Answer
https://www.cbsd.org/cms/lib/PA01916442/Centricity/Domain/2834/Piecewise%20graph%20worksheet%20Answers.pdf
