Mean ?

The mean of \(25\) numbers is \(20\). If \(5\) is added to each of the first \(10\) numbers, find the mean of new set of \(25\) numbers.

Details and Assumptions:

The mean refers to the Arithmetic Mean. For example, the mean of the numbers \(1, 2\) and \(3\) is \(\frac{1+2+3}{3}=2\).

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