Question: the average age of 30 students in a class is 10 years . if teacher ' s age is also included then average increases 1 year then find the teacher ' s age ?
A) 59
B) 55
C) 61
D) 41
E) 36
Correct answer: d
Grade: 7 | Topic: Expressions and Equations | Difficulty: Medium | Standard: 7.EE.B.3