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20-02-2017
Mathematics

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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 changes to 21.6 years old, how old are the twins?

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chatterbox1a1a chatterbox1a1a

20-02-2017

20.9 times 20 plus 29 times 2 equals 476. Divide that by 22 and it equals about 21.6. Thus the twins are 29 years old

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