the average of seven numbers is 6.what is the eight number to be added to increase the average to 10.
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The total sum of seven numbers is 7x6=42
The total sum after 8th number been added= 10x8=80
The 8th number = 80-42=38
The total sum after 8th number been added= 10x8=80
The 8th number = 80-42=38
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a+b+c+d+e+f+g / 7 = 6
a+b+c+d+e+f+g = 42
a+b+c+d+e+f+g+h / 8 = 10
We know a+b+c+d+e+f+g = 42
So, 42+h = 80
h = 80 - 42
h = 38
Hence 38 must be added
a+b+c+d+e+f+g = 42
a+b+c+d+e+f+g+h / 8 = 10
We know a+b+c+d+e+f+g = 42
So, 42+h = 80
h = 80 - 42
h = 38
Hence 38 must be added
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