The surnames of 40 children in a class arranged in alphabetical order. 16 of the surnames begins with O and 9 of the surname begins with A, 14, of the letters of the alphabet do not appear as the first letter of a surname

If more than one surname begins with a letter besides A and O, how may surnames begin with that letter

They got 6 but I want to know how in proper analysis

Thanks

5 answers

25 of the 40 begin with A or O.
14 letters do not appear, so 10 letters are left.
I don't see how they can say that 6 begin with some other letter. It is clear that since 15 names begin with one of the 10 letters, so there are 5 left over. That does not mean that all 5 of the extras begin with the same letter.
Agreed
I have been going but over this
Maybe the question was intended to be

If only one letter besides A and O begins more than one surname, how may surnames begin with that letter?

Then 6 would be the answer.
Give proper solutions
Anyone?
How is six gotten or what is the answer