Arithmetic Aptitude :: Average
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Find the average of the square of first 5 consecutive odd numbers starting from 1 to 9, where the last odd number is 9.
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The average age of a group of 6 boys is 19. If the new average age after a boy joins the group is 21.28, find the age of new boy.
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The average weight of a group of 5 boys is 26. If we replace a boy of weight 25 in the group with another boy so that new average increases by 3, find the weight of the new body.