The average of X, Y and Z is 2X. If the average of Y and Z is 20, then what is the value of X ?
Answer & explanation
Correct answer: option 2
Sum of X , Y & Z
X + Y + Z = 3 × 2X = 6X ----(1)
Sum of Y & Z = 2 × 20 = 40
Put ( Y + Z ) in eqn 1
40 + X = 6X
5X = 40
X = 8
So , Value of X = 8