The value of X is 4, and the value of Y is 3*x. The value of Z is X+Y. What is the value of Z?
Your question could be formulated in the following form:
X = 4
Y = 3*X
Z=Y+X

Since X is known, we can fill it in:
Y=3*4 = 12
Z=4+Y

Now that Y is known, we can fill it in:
Z= 4+12 = 16

The value of Z is 16
Now what if x is 5