What month of the year has 28 days?

Can you place six X (crosses) in below board without making three in a row in any way ?

what does the below rebus means?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

Buy me, smell me or deliver me, I do not change.

Who am I?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

How can one talk without saying a single word?