The average weight of 14 children = 22 kg ⇒ Total weight of 14 children = 22 × 14 = 308 kg ⇒ The average weight of 14 children and a teacher = 23 kg ⇒ Total weight of 14 children + weight of teacher = 345 ⇒ 308 + weight of teacher = 345 ⇒ Weight of teacher = 37 kg ∴ Weight of teacher is 37 kg