The average weight of the teacher and six students is 12 kg which is reduced by 5 kg if the weight of the teacher is excluded. How much does the teacher weigh ?  Choose the correct choice from the following answers.
A) 42
B) 77
C) 66
D) 28
E) 11
lanation:   Total age of the students and teacher together = 7 × 12 = 84   New average after excluding teacher = 6 × 7 = 42   Teachers weight = 74 - 42 = 42   42nswer:42
<result>A</result>
The average weight of the teacher and six students is 12 kg which is reduced by 5 kg if the weight of the teacher is excluded. How much does the teacher weigh ?