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79 is the average
If three of the four numbers are 79, 80, and 65, and the average is 85, then the final number will equal (85 x 4) - 79 - 80 - 65 = 116.
85 + 67= 152! ;p
67. It is the difference between the highest number: 99, and the lowest number: 32.
The multiples of five between sixty and ninety (inclusive) are 60, 65, 70, 75, 80, 85 and 90.