Averages & Ages — practice questions, page 5
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A batsman's average in 16 innings is 36 runs. In the 17th innings he scores 70 runs. Find his new…Arjun's father is 30 years older than Arjun. Five years from now, the father will be exactly 3…Eight readings in a lab notebook average 42. If one reading is struck off, the rest average 40.…A batch of 35 apprentices has an average age of 21 years. When the instructor is counted too, the…Seven parcels weigh 18 kg on average. When one parcel is taken out, the average of the rest is 17…In a class of 24 children the average age is 11 years. When the class teacher's age is included,…What is the average of all the even numbers from 2 to 40?The sum of the present ages of a mother and her daughter is 50 years. Five years ago, the mother's…Seven numbers have an average of 53. If the number 29 is taken out, what is the average of the…The 32 boys in a hostel wing have a mean age of 13 years. Counting the warden too, the mean goes…Meera lists the first seven multiples of 4. What is their average?Uma's grandfather is 50 years older than Uma. Ten years from now he will be exactly 3 times her…Five years ago, a man's age was 5 times his son's age. If the man is now 40 years old, find the…The average age of 6 people is 25 years. When one more person joins, the average becomes 26 years.…Six numbers have a mean of 34. Dropping one of them lowers the mean of the remaining five to 31.…The average age of 8 men increases by 2 years when a new man replaces one of them who is 24 years…The average weight of 3 boys is 54 kg. When a fourth boy joins them, the average becomes 56 kg.…5 years ago Mrs. Iyer was 7 times as old as her daughter Meera. Today she is 4 times as old as…A mother is 28 years older than her son. 6 years from now she will be exactly 3 times his age.…The average of 5 numbers is 44. If the number 60 is removed, what is the average of the remaining…The average age of 6 members is 28 years. When a new member joins, the average becomes 30 years.…Eleven numbers average 36. After one of them is dropped, the rest average 35. Which number was…A hockey squad of 15 players has an average age of 21 years. When the coach joins them, the…A father is 34 years older than his son. In 3 years, the father's age will be three times the…Four siblings have an average age of 14 years. Three of them are 9, 12 and 17 years old. How old…
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