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The average of 4 number is 85. if three of the numbers are 76, 78, and 81 what is the fourth number.
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The average of 4 number is 85. if three of the numbers are 76, 78, and 81 what is the fourth number.

User Internet Man
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[ ( x + 76 + 78 + 81 )/4 ] = 85

x + 235 = 340

x = 105
User Mark Silverberg
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