Answer:
B.) 3
Step-by-step explanation:
2x+y=5
3y+z=15
3z+2x=16
__________
4x+4y+4z=36 ( Added all the Equations)
x+y+z=9 (Divided by four)
Since we're trying to find the average, we have to add x, y, and z, and then divide by three (x is one, y is the second, and z is the third) because the average is the sum of all the numbers divided by the amount of numbers.
x+y+z=9
Average(x+y+z)=3
