Question : If the average of 20, 40, 50, Y and Z is 45, then what is the average of Y and Z?
Option 1: 58.5
Option 2: 57.5
Option 3: 56.5
Option 4: 55
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Correct Answer: 57.5
Solution : The average of 20, 40, 50, Y, and Z is 45. The sum of these numbers = 45 × 5 = 225 So, the sum of Y and Z is, Y + Z = 225 – 20 – 40 – 50 = 115 Average = $\frac{Y + Z}{2} = \frac{115}{2}$ = 57.5 Hence, the correct answer is 57.5.
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