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

The Correct Option is B

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 \(x,y,z =\frac{x+y+z}{3}\)
\(⇒\)\(\frac{80+10}{3}\)\(= 30\)