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The Average Age Of A Group Of 10 Students Was 10. The Average Age Increased By 1 Year When Two New Students Joined The Group. What Is The Average Age Of The Two New Students Who Joined The Group? |
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Answer» The average age of a group of 10 students is 10. Therefore, the sum of the ages of all 10 of them = 10 * 10 = 100 When TWO students join the group, the average increase by 1. => New Average = 11 Now there are 12 students. Therefore, sum of all the ages of 12 students = 11 X 12 = 132 Therefore, the sum of the ages of two students who JOINED = 132 - 100 = 32 And the average age of these two students = (32 / 2) = 16 The average age of a group of 10 students is 10. Therefore, the sum of the ages of all 10 of them = 10 * 10 = 100 When two students join the group, the average increase by 1. => New Average = 11 Now there are 12 students. Therefore, sum of all the ages of 12 students = 11 x 12 = 132 Therefore, the sum of the ages of two students who joined = 132 - 100 = 32 And the average age of these two students = (32 / 2) = 16 |
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