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A group has 6 students and 1 year ago, their average age was 16.5 years. If 1 more student is added in the group, the average age of the group remains same. Find the current age of new member.1). 9.5 years2). 11.5 years3). 10 years4). 10.5 years |
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Answer» SUM of ages of 6 STUDENTS 1 YEAR ago = 16.5 × 6 = 99 Sum of CURRENT ages of 6 students = 99 + 6 × 1 = 105 Since the average remains same even after adding 1 more student: ∴ Sum of Current ages of 6 students = 16.5 × 7 = 115.5 ∴ Age of NEW student = 115.5 - 105 = 10.5 years |
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