Answer: welcome
Step-by-step explanation:
x
−
z
=
18
Explanation:
We can write the following averages:
x
+
y
+
80
3
and
y
+
z
+
80
3
The first (red) one is greater than the second (blue) one by 6.
Therefore the difference is 6.
x
+
y
+
80
3
−
y
+
z
+
80
3
=
6
×
3
3
×
(
x
+
y
+
80
)
3
−
3
×
(
y
+
z
+
80
)
3
=
6
×
3
x
+
y
+
80
−
(
y
+
z
+
80
)
=
18
x
+
y
+
80
−
y
−
z
−
80
=
18
x
+
y
+
80
−
y
−
z
−
80
=
18
×
×
×
×
×
×
×
x
x
−
z
=
18
