SAT math arithmetic mean

[Nyla]

SAT math arithmetic mean

Could you help with the following SAT math question:
"Find the arithmetic mean of x,y, and z If 4x+3y=7 and y+4z=17"

Thanks!!

[Jack]

SAT math arithmetic mean


"Find the arithmetic mean of x,y, and z If 4x+3y=7 and y+4z=17"

Adding the given equations you have 4x+4y+4z=24

and then divide by 4 the previous equation gives you

x+y+z=6

Therefore the arithmetic mean of these three variables are:

\frac{x+y+z}{3}=\frac{6}{3}=2

[Nyla]

Thanks Jack;)