IF THIS IS NOT a trick question, there are 5 vowels and 21 consonants in the English alphabet, (at the moment!) making a total of 26 letters in the English alphabet.
(The number of letters has changed over the centuries, but this is another matter!)
The letters a,e,i,o,u, are traditionally called vowels (See Cambridge Advanced Learner's Dictionary) but, to be technical, the vowel 'sound' is also associated with the 'consonants' w and y.
(Merriam-Webster's dictionary says: Vowel: a letter or other symbol representing a vowel -usually used in English of a, e, i, o, u, and sometimes y.)
IF THIS IS a trick question, and actually means "How many vowels and consonants are in the words 'English alphabet'?", the answers could be:
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It depends on which alphabet you are talking about. FOr example:
The Latin alphabet for English has 5 vowels (y and w are sometimes included as well).
The Hebrew alphabet has no vowels.