Question

the average of seven numbers is 6. what is the eight number to be added to increase the average to 10

Answer 1

let the numbers be x,y,z,a,b,c
x+y+z+a+b+c/6 = 8
x+y+z+a+b+c = 48
let the 7th number be m
x+y+z+a+b+c+m/7 = 10
48+m/7 = 10
48+m = 70
m = 70 - 48
m = 22

Answer 2

here is your answer 32should be the eight no.