Averages & Ages — practice questions, page 9
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QuestionA set of numbers has an average of 18. When the number 46 is added to the set, the average becomes…QuestionThe ages of the 6 members of a colony welfare committee add up to 246 years today. Two of them,…QuestionThe average marks of 30 pupils in a test were worked out as 74. It was later found that two…QuestionSunil is 38 today and his nephew is 14. How many years ago was Sunil's age three times his…QuestionThe average monthly rainfall at a weather station over June, July and August was 220 mm, and over…QuestionA picnic bill of ₹7,200 was to be shared equally among a group of friends. Three of them did not…QuestionThe average age of the 5 members of a music club is 34 years. A new member joins and the average…QuestionSix numbers average 30. Four of them are 24, 28, 35 and 41, and the remaining two are equal to…QuestionA mother is 28 years older than her son. At some point in the future her age will be exactly three…QuestionA standby power unit ran on 4 days of the first week, turning out an average of 55 units of…QuestionEight years ago Farhan's age was half his sister's age. Today their ages add up to 52 years. How…QuestionFor 15 numbers, the overall average is 60. The average of the first 8 of them is 58 and the…QuestionOn their wedding day the average age of a couple was 27 years. Today they have a daughter of 4 and…QuestionVikram has written 4 of the 6 papers in an exam and his average so far is 63 marks. He wants his…QuestionDeepa is twice as old as Kiran, and Kiran is 5 years younger than Malini. If Malini is 21 years…QuestionThe average height of the 11 boys in a school choir is 148 cm. The tallest boy stands 24 cm above…QuestionThe average age of the 4 doctors at a small clinic is 41 years. One of them, aged 56, leaves and a…QuestionTen numbers have an average of 46. Five of the numbers are each increased by 8 and the other five…QuestionWhat is the average of all the two-digit whole numbers that are multiples of 9?QuestionWhat is the average of the prime numbers lying between 20 and 40?QuestionWhat is the average of the squares of the first 5 counting numbers?QuestionWhat is the average of all the multiples of 6 that lie between 50 and 100?QuestionFive different whole numbers, each greater than 0, have an average of 12. What is the largest that…QuestionThe average age of the 5 trustees of a temple trust is 40 years. The youngest trustee is 30 years…QuestionIf 5 numbers have an average of 20 and none of the five is less than 15, what is the greatest…
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