The average weight of 29 students is 28 kg. By the admission of a new student, the average weight is reduced to 27.3 kg. The weight of the new student is
Choose the correct choice:
A) 22 kg B) 21.6 kg C) 22.4 kg D) 21 kg E) 7 kg

Rationale: "exp . the total weight of 29 students = 29 * 28 the total weight of 30 students = 30 * 27.3 weight of the new student = ( 30 * 27.3 – 29 * 28 ) = 819 - 812 = 7 answer : e"
Answer: E