the average age of a group of 20boys is increased by one year when 5 of them whose average age is 20 years are replaced by 5 new boys. the average age of new comers is?
Answers
Answered by
1
Given : y/5 = 20 or y = 100
(x - y + z) / 20 = 1 + (x/20)
(x-100 +z)/20 = (x/20) + 1
or z/20 = 6 or Z = 120
Average of 5 new comers = Z / 5 = 120 / 5 = 24 years
Similar questions