It is 58 because 58+25 = 83
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The answer could be any number between 39 to 45. When doubled this produces 78 to 90. and with 7 subtracted this gives 71 to 83.
83
30 - 5 = 25 correct answers. 25/30 x 100 = 83% (rounded to a whole number)
There is an infinite number of possible answers. If you have 83, 83, 83, etc. the mean is 83. If you have 82, 83, and 84, the mean is 83.
83-n