Question

The average (arithmetic mean) of x and y is 40. If z = 10, then what is the average of x, yand z?

• A. $16\frac{2}{3}$
• B. 30
• C. 25
• D. $17\frac{1}{2}$

Answer 1

Answer: (B)

30

Answer 2

The correct option is (B): 30
Given that: arithmetic mean of $x \space and \space y= 40$
⇒$$\frac{x+y}{2}=40 ⇒ $x+y=80$
given that $z=10$
so A.M of $x,y,z =\frac{x+y+z}{3}$
⇒$$\frac{80+10}{3}$$= 30