The average weight of 19 students is 15kg. by the admission of a new student the average weight is reduced to 14.4 kg. the weight of the new student is ? Pick one
A) 10.6 kg
B) 3 kg
C) 11 kg
D) 14.9 kg
E) none

Rationale: "answer weight of new student = total weight of all 20 students - total weight of initial 19 students = ( 20 x 14.4 - 19 x 15 ) kg = 3 kg . correct option : b"
Answer: B