Average Quizzes Post published:March 26, 2020 Post category:Aptitude Quizzes Post comments:0 Comments 0% 1 votes, 5 avg 6 See time here Aptitude Quizzes Average Quiz 1Total Questions: 10Time: 10 minutes 1 / 10 Category: Average QuestionsA family consists of two grandparents, two parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family? 33(3/7) Years 31(5/7) Years 32(4/7) Years 28(4/7) Years Required average=67 x 2 + 35 x 2 + 6 x 32 + 2 + 3=134 + 70 + 187=2227= 315years.72 / 10 Category: Average QuestionsThe average of 20 numbers is zero. Of them, at the most, how many may be greater than zero? 1 10 19 0 Explanation:Average of 20 numbers = 0. Sum of 20 numbers (0 x 20) = 0.It is quite possible that 19 of these numbers may be positive and if their sum is a then 20th number is (-a)3 / 10 Category: Average QuestionsThe average age of 30 boys in a class is 15 years. If we include the age of two teachers the average age increases by 1. Find the sum of ages of the two teachers. 64 years 55 years 58 years 62 years Explanation:Total age of 30 boys would be = 30∗15 = 450 yearsTotal age of 30 boys and 2 teachers would be = 32∗16= 512 years∴ Sum of ages of two teachers would be = 512 – 450 = 62 years4 / 10 Category: Average QuestionsThe average weight of 10 men is decreased by 2 kg when one of them whose weight is 60 kg is replaced by a new man. What is the weight of the new man? 40 35 50 45 Explanation:Average decrease in weight per person = 2kgThere are 10 men so total decrease in weight on replacing a man with a new man = 10 ∗ 2= 20 kgWeight of the man who is replaced = 60 kg∴The weight of the new man would be = Weight of man replaced – total decrease in weight of the group of 10 men.= 60 – 20 = 40 kg5 / 10 Category: Average QuestionsA car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year? Rs. 7.89 Rs. 7.88 Rs. 7.95 Rs. 7.98 Explanation:Total quantity of petrolconsumed in 3 years=4000+4000+4000 litres7.5088.50= 40002+1+2 litres15817=76700 litres51Total amount spent = Rs. (3 x 4000) = Rs. 12000. Average cost = Rs.12000 x 51= Rs.6120 = Rs. 7.98767007676 / 10 Category: Average QuestionsAverage age of a group of 30 boys is 16 years. A boy of age 19 leaves the group and a new boy joins the group. If the new average age of the group is 15.8 years, find the age of the new boy. 13 years 14 years 12 years 15 years Explanation:Let the age of new boy = X yearsTotal age of 30 boys = 30*16 = 480 yearsAs per question, if we minus age of boy who leaves the group and then add the age of boy who joins the group the new average becomes = 15.8 years.∴ = 15.8480 – 19 + X = 474X = 474 – 480 +19X = – 6 +19= 13 yearsTry to solve more problems on average.7 / 10 Category: Average QuestionsIn Arun's opinion, his weight is greater than 65 kg but less than 72 kg. His brother doest not agree with Arun and he thinks that Arun's weight is greater than 60 kg but less than 70 kg. His mother's view is that his weight cannot be greater than 68 kg. If all are them are correct in their estimation, what is the average of different probable weights of Arun? 63 kg. 69 kg. 67 kg. 72 kg. Explanation:Let Arun's weight by X kg.According to Arun, 65 < X < 72According to Arun's brother, 60 < X < 70.According to Arun's mother, X <= 68The values satisfying all the above conditions are 66, 67 and 68. Required average =66 + 67 + 68=201= 67 kg.338 / 10 Category: Average QuestionsThe captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team? 24 years 25 years 23 years 22 years Explanation:Let the average age of the whole team by x years. 11x - (26 + 29) = 9(x -1) 11x - 9x = 46 2x = 46 x = 23.So, average age of the team is 23 years.9 / 10 Category: Average QuestionsThe average of Sohan’s marks in 6 subjects is 74. If his average in five subjects excluding science is 70, how many marks he obtained in science? 90 92 88 94 Explanation:Total marks obtained in 6 subjects = 6 ∗ 74 = 444Total marks in 5 subjects excluding science = 5 ∗ 70 = 350Therefore, marks obtained in science would be = 444 – 350 = 9410 / 10 Category: Average QuestionsThe average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is: 45 years 50 years 35 years 40 years Explanation:Sum of the present ages of husband, wife and child = (27 x 3 + 3 x 3) years = 90 years.Sum of the present ages of wife and child = (20 x 2 + 5 x 2) years = 50 years. Husband's present age = (90 - 50) years = 40 years. 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