Question

The average age of three brothers is 6 year if the age of two brothers are 6 years and 7 years find the age of third brother

Answer 1

Answer:

The age of the third brother is 5.

Step-by-step explanation:

Let the age of the third brother be x

• The  average = sum of the ages of the three brothers/3
• 6 = 6 + 7 + x/ 3
• 6 = 13+x/3
• 6×3 = 13+x
• 18 = 13+x
• 18 - 13 = x
• 5 = x

Therefore, the age of the third brother is 5.