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The average age of eight teachers in a school is 40 years. A teacher among them died at the age of 55 years whereas another teacher whose age was39 years joins them. The average age of the teachers in the school now is (in years)

The average age of eight teachers in a school is 40 years. A teacher among them died at the age of 55 years whereas another teacher whose age was39 years joins them. The average age of the teachers in the school now is (in years) Correct Answer 38

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Questions below followed by three quantities. Find the relationship between them. Quantity I: In a class with a certain number of students if a teacher weighing 78 kg is added, then average weight of class is increased by 2 kg. If one more teacher weighing 66 kg is added, then the average weight of the class increases by 3.5 kg over the original average. What is the original average weight (in kg) of the class? Quantity II: The average age of 16 students and their teacher's age is 16 years. If the teacher's age is excluded, the average reduces by 2. What is the teacher's age? Quantity III: Average weight of three friends A, B and C is 46 kg. Another person D joins the group and now the average is 45 kg. If another person E whose weight is 6 kg more than D, joins the group replacing A, then average weight of B, C, D and E becomes 47 kg. What is the weight of A (in kg)?
The average age of 10 teachers in a school was 48 years. A teacher aged 56 years died and another teacher resigned, and a new teacher of age 32 joined the school. If the average age of the teachers in the school now becomes 45 years. What is the age of the teacher who resigned? 
Eight teachers of different departments - English, math, accounts, economics, geography, biology, chemistry and sociology went for a meeting. There are 2 rows. Each row contains 4 teachers. Teachers of biology and chemistry are sitting adjacent to each other. Opposite to chemistry teacher is accounts teacher who is at extreme left end of south face row. Teacher of English department is sitting somewhere in north facing row but not at any extreme end. Math teacher is sitting second to the right of accounts teacher. Economics teacher is not sitting opposite to biology teacher and not adjacent to English teacher. Where is economics department teacher sitting?
The following question has three statements. Study the question and the statements to decide which of the statement(s) is/are necessary to answer the question. A committee having 2 Hindi teachers and 2 English teachers is to be formed from some ‘Hindi teachers’ and ‘English teachers’. The probability of doing so is 3/5. Find the total number of Hindi and English teachers. Statement I: Number of ways to choose 2 teachers out of total teachers is 15 Statement II: Number of ways to choose 2 Hindi teachers out of total Hindi teachers is 3 Statement III: Number of English teachers is 3
8 teachers of different subjects sat around a circular table to discuss the time table for examinations. Chemistry teacher is sitting opposite to History teacher. Economics teacher who is closest to Hindi teacher is sitting in adjacent right of Biology teacher. History and Civics teachers are sitting together whereas Physics and Hindi teachers are sitting farthest from each other. Biology teacher is sitting in between Economics and Chemistry teacher. Who is sitting opposite to English teacher?
In a group of 450 Teachers, 22% of the total Teachers take the English department, 34% of the total Teachers take the quant. department, and 26% of the total Teachers take the LR department. 8% of the total Teachers have taken both English and quant department only. Out of the total Teachers in the English department, 1 / 3 have taken both English and LR department only. Out of the total Teachers in the quant department, 1 / 3 have taken both quant and LR department only. Only 20 Teachers take all the three departments. Find the number of Teachers who have not taken any department. 
Questions below followed by three quantities. Find the relationship between them. Quantity I: Average age of 14 members of team is 25 years. While oldest member of the team is 26 years older than youngest member of the team. Out of remaining 12 members of team, average age of six members of team is 28 years and the remaining six members is 20 years. What is the age of oldest member of the team? Quantity II: Average age of Nitu, Rekha and Shyam is 17 years. Two new persons Divya and Raju joined them so that average age of all become 19 years. If Divya is 2 years older than Raju and Rekha is 2 years older and 1 year older than Shyam and Nitu respectively. What is sum of the average age of Nitu and Shyam together and average age of Divya and Rekha together? Quantity III: The average age of father, mother and their two sons is 27.5. Five years ago, the ratio of ages of father, mother and two sons (elder and younger) is 7 : 5 : 2 : 1. Find the sum of ages of two sons after 7 years.
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In a group of 33 teachers in a high school, 7 teachers teach chemistry, 19 teachers teach physics and 18 teachers teach mathematics. Also, 3 teachers teach both chemistry and physics, 8 teachers teach both physics and mathematics and none of teachers teach both chemistry and mathematics. Then, find the number of teachers who teach only chemistry?
In a company there are 252 engineers, in which the ratio of the number of electronics engineers and computer engineers is 2 ∶ 1. The ratio of the number of electronics engineers and computer engineers becomes 1 ∶ 1 after recruitment of some more computer engineers. The average age of all the engineers is now 22 years and the average age of the computer engineers is 2 years less than the average age of electronics engineers. (A) The average age (in years) of electronics engineers is 21 (B) The average age (in years) of computer engineers is 21 (C) The average age (in years) of electronics engineers is 23 (D) The average age (in years) of electronics engineers is 25 (E) The average age (in years) of computer engineers is 23 Choose the correct answer from the options given below: