average age of 6 people 6 years ago was 42 years. now if the 7 th person joins the group average becomes 46 years. find the age of 7 th person after 7 more years?
Answers
Answered by
0
Step-by-step explanation:
Average age of 30 students=9
Total age of 30 students = 30 ×9=270 (1)
Average including teacher (31 person, 30 students + 1 teacher) =10
Total age including teacher=31×10=310
Age of 30 students + age of teacher =310
By(1) Replace Age of 30 students with 270
270 + Age of teacher = 310
Age of teacher =310–270=40
Similar questions