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ATQ, Let's denote the sum of the original 10 numbers as 'S', and the average as 'A'. Original average:- A = 30 Original Sum = S = A × Number of terms = 30 × 10 = 300 Now, let's consider the change in the numbers: 1) One number is increased by 30. 2) Five numbers are decreased by 4 each. 
Therefore, new average is 31.
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