Question 677396
Three of four numbers have a sum of 22.
a + b + c = 22
:
 If the average of the four numbers is 8,
{{{(a + b + c + d)/4}}} = 8
Replace a + b + c with 22
{{{(22 + d)/4}}} = 8
multiply both sides by 4
 22 + d = 32
d = 32 - 22
d = 10 is the fourth number?