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The mean of the ages of 40 pupils in a class is 17.7years. One girl...

The mean of the ages of 40 pupils in a class is 17.7years. One girl leaves the class and one boy is registered, and the new average age of 40 pupils in the class changed to 17.6years. How much older is the girl than the boy?
In Mathematics
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Asked by Aga on 11th May, 2020
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