Average – Aptitude MCQ Questions – 15 Posted on July 7, 2020July 7, 2020 by admin Question 1The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class, thereby decreasing the average by 4 years. The original strength of the class was- A. 10 B. 11 C. 12 D. 15 Question 2The average weight of a class of 24 students is 35 kg. If the weight of the teacher be included, the average rises by 400 g. The weight of the teacher is - A. 45 kg B. 50 kg C. 53 kg D. 55 kg Question 3The average of the first five multiples of 3 is- A. 3 B. 9 C. 12 D. 15 Question 4The average of X1, X2 and X3 is 14. Twice the sum of X2 and X3 is 30. What is the value of X1? A. 12 B. 16 C. 20 D. 27 Question 5If 25a + 25b = 115, what is the average of a and b? A. 2.5 B. 3.4 C. 4.5 D. 4.6 E. None of these Question 6Find the average of the following sets of scores: 385, 441, 876, 221, 536, 46, 291, 428 A. 221 B. 403 C. 428 D. 536 Question 7The average weight of a group of 75 girls was calculated as 47 kgs. It was later discovered that the weight of one of the girls was read as 45 kgs. Whereas her actual weight was 25 kgs. What is the actual average weight of the group of 75 girls? ( Rounded off to two digits after decimal). A. 34 B. 36 C. 30 D. None of these Question 8The average of two numbers is XY. If one number is X, the other is- A. Y/2 B. Y C. 2XY - X D. X (Y - 1) Question 9The average monthly income of P and Q is Rs. 6000; that of Q and R is Rs. 5250; and that P and R is Rs. 5500. What is P’s monthly income? A. Rs. 3500 B. Rs. 4500 C. Rs. 6250 D. Rs. 4800 Question 10In a primary school the average weight of male students is 65.9 kg and the average weight of female students is 57 kg. If the average weight of all the students ( both male and female ) is 60.3 kg and the number of male students in the school is 66, what is the number of female students in the school? A. 162 B. 168 C. 180 D. 112