Question

0. If x+y=6, y+z=7 and Z+x=9, the
average (arithmetic mean) of x,y and z
IS:
b. 172
d. 11
a. 1/3
c. 2/3​

Answer 1

Answer:

You mean “the arithmetic mean”, also called “the average”, i.e. (x+y+z)/3. Adding your three equations together, you get 2(x+y+z)=22. So x+y+z=11 and (x+y+z)/3=11/3.