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The average age of 5 boys of a class is 15. If 7 more boys are admitted to the class with average age 12, and 3 of the existent boys leave the class with the average age 13, what will be the new average age of the boys of the class?

The average age of 5 boys of a class is 15. If 7 more boys are admitted to the class with average age 12, and 3 of the existent boys leave the class with the average age 13, what will be the new average age of the boys of the class? Correct Answer 6.3

Total age of the existent boys = 5 * 15 = 75 Total age of the newly admitted boys = 7 * 12 = 84 Total age of the boys who left the class = 13 * 3 = 39 Total age of the class newly formed = 75 + 84 – 39 = 120 Total number of boys in new class = 15 + 7 – 3 = 19 Average of the newly formed class = 120 / 19 = 6.3

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