the average age of 25 boys in a class decrease by 6 months when a new boy takes the place of a 20 year old boy find the age of the new boy ?
Answers
Answered by
3
Step-by-step explanation:
The average of new boy is 7.5 years.
New boy of age 'y' years is added and an old boy of age 20 years is removed. Also, in the question, it is told that the average age of 25 boys decreases by 6 months ( 0.5 years), when the substitution takes place. Thus, the avg. age of new boy is 7.5 years
Similar questions