Answer :
# 4 per 18 students so
4/18 = .22 halves of a chaperon per student. lol
81 x .22 = 17.82 chaperons or in reality 18 chaperons.
4/18 = .22 halves of a chaperon per student. lol
81 x .22 = 17.82 chaperons or in reality 18 chaperons.