The average weight of 19 students is 15kg. by the admission of a new student the average weight is reduced to 14.9 kg. the weight of the new student is ?
Choose the most appropriate option
A) 10.6 kg
B) 10.8 kg
C) 11 kg
D) 13 kg
E) none

Rationale: "answer weight of new student = total weight of all 20 students - total weight of initial 19 students = ( 20 x 14.9 - 19 x 15 ) kg = 13 kg . correct option : d"
Answer: D