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?
Answer: 56
Explanation
1. Original total age of 13 boys:
13 boys×13 years=169 years2. 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
3. Sum of ages of the 2 new boys =
225−169=56 years
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