Question 750173: If the average of marks of four student be 62, mark of one student is 1 less then the average,mark of second student is 7 more then average,mark of third student is 1 less then the average then find the mark of fourth student.
Answer by FrankM(1040)   (Show Source):
You can put this solution on YOUR website! You have -1,+7,-1 and need to find a 4th number that zeroes out the differences.
7-1-1 = 5
and x-1, x+7, x-1, x-5 will average to x
You can substitute 62 for x to confirm, but this approach works regardless of the base number. We can answer without even knowing that average.
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