Question: the average age of 28 students in a group is 16 years . when teacher â € ™ s age is included to it , the average increases by one . what is the teacher â € ™ s age in years ?
A) 45
B) 36
C) 41
D) 51
E) 48
Correct answer: a
Grade: 7 | Topic: Expressions and Equations | Difficulty: Medium | Standard: 7.EE.B.3