You can
put this solution on YOUR website!
Here's one exactly like it that you can use as a guide
to solve yours. I'm just changing your 192 to 40.
x+y+z=40
x=y+z
x=4z
Notice that the first two equations both have (y+z)
I'll put them in parentheses to make it clear:
x+(y+z)=40
x=(y+z)
x=4z
Since the second equation tells us that (y+z)=x, we can
substitute x for (y+z) in the first equation:
x+(x)=40
2x=40
x=20
Then substitute 20 for x in x=4z
20=4z
5=z
Finally substitute x=20 and z=5 in x=(y+z)
20=(y+5)
20=y+5
15=y
Now do yours exactly the same way. {Yours will have bigger numbers
because 192 is bigger than 40
Edwin