Avg of 6 numbers = 30 Sum of 6 numbers = 6 x 30 = 180 Avg of first 4 numbers = 25 Sum of first 4 numbers = 4 x 25 = 100 Avg of last 3 numbers = 35 Sum of last 3 numbers = 3 x 35 = 105 Now, let's find the 4th number: Sum of first 3 numbers = Sum of first 4 numbers - 4th number = 100 - 4th number Sum of first 3 numbers = Sum of all 6 numbers - Sum of last 3 numbers = 180 - 105 = 75 So, 75 = 100 - 4th number 4th number = 100 - 75 = 25
The average of 6 numbers is 30. If the average of the first four is 25 and that of the last three is 35, the fourth number is?
Review the verified answer and explanation for this ASF Airports Security Force past-paper question on CampusFin.
Question context
This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.