ON MONDAY YOU GOT SICK BUT YOU WENT TO SCHOOL ANYWAY. ON WEDNSDAY 4 OF YOUR CLASS MATE CAUGHT THE COLD. FROM ALL THOSE PERSONS, 4 MORE CAUGHT IT ON FRIDAY. FROM EACH OF THEM PERSONS WHO GOT SICK ON FRIDAY, 4 MORE CAUGHT THE COLD ON SUNDAY. HOW MANY PPL CAUGHT THE COLD ON SUNDAY ?