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The numbers are 7 and 28 which equals 35 when added together
The average, in this case, is the sum divided by 4 (since there are 4 numbers).
the mean of four numbers is 25 and three of the numbers are 17 23 and 25 what is the fourth number?
Four examples of irrational numbers are 21/2, 31/2, 51/2 & 71/3