If the average of 20, 40, 50, Y and Z is 45 , then what is the average of Y and Z ?

58.5 57.5 56.5 55

57.5

Total sum of 5 numbers = 5 × 45 = 225 ATQ , 20 + 40 + 50 + Y + Z = 225 Y + Z = 115 Average of Y & Z = \(\frac{115}{2}\) = 57.5