Question

Mean of three no is 8 .the meanof those 3 no and x is 7.findx

Answer 1

mean of three numbers= 8
Sum of three numbers=8*3=24
according to given condition (24+x)/4=7
by solving the above equation wet will get x=4

Answer 2

Mean of three numbers = (sum of three numbers)/(3)

8 = (sum of 3 numbers)/3

8 × 3 = sum of three numbers

24 = sum of three numbers

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Mean of 3 numbers with x = (sum of three numbers + x)/4

7 = (24 + x)/4 

7×4 = 24 + x

28 = 24 + x

28 - 24 = x 

4 = x 



i hope this will help you



by ABHAY