The Latin alphabet originally consisted of 21 letters. It was derived from the Etruscan alphabet, which in turn was adapted from the Greek alphabet. The classical Latin alphabet included the following letters: A, B, C, D, E, F, G, H, I, K, L, M, N, O, P, Q, R, S, T, V, X.
Over time, the Latin alphabet evolved. The letters Y and Z were added later to represent sounds in words borrowed from Greek. This brought the total number of letters to 23. The letter J was introduced in the Middle Ages as a variant of I, and U and W were developed from V during the same period. These additions eventually expanded the Latin alphabet to the 26 letters we use today in the modern English alphabet.
So, to answer the question, the Latin alphabet was not 24 letters. It started with 21 letters, expanded to 23, and eventually grew to 26 letters in its modern form.