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Mathematics, 27.08.2019 00:00 deathfire5866
If i had 30 students in a class and the average age was 20.9 and i added twins and the average age changes to 21.6 years old, how old are the twins?
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If i had 30 students in a class and the average age was 20.9 and i added twins and the average age c...
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