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Let denote the missing number with x. So we have:

(76 + 78 + 81 + x)/4 = 85

(235 + x)/4 = 85

(4)(235 + x)/4 = (4)(85)

235 + x = 340

235 - 235 + x = 340 - 235

x = 105

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โˆ™ 2009-02-04 17:54:39
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Q: The average of 4 numbers is 85 in the numbers 76 78 and 81 what number would come next?
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