The average age of group of 13 boys is 13. When two boys are joined group. The average rose by 2 years the sum of ages to 2 new boys is?
The average age of group of 13 boys is 13. When two boys are joined group. The average rose by 2 years the sum of ages to 2 new boys is?
Explanation
1. Original total age of 13 boys:
2. New average after 2 boys join = 13 + 2 = 15 years
Total boys = 13 + 2 = 15 boys
So, the total age of the 15 boys = 15×15=225 years