Average
1. Find the average of first 20 multiples of 7 ?
A. 72.5
B. 74.5
C. 71.5
D. 73.5
D. 73.5
2. The average age of a class of 39 students in 15 years. If the age of the teacher be included, then the average increases by 3 months. Find the age of the teacher.
A. 25 years
B. 39 years
C. 29 years
D. 30 years
A. 25 years