The average of the 3 numbers is 45. Two of the numbers are 55 and 30. The third number is _____?
- 60
- 50
- 40
- None of these
Explanation
Let the third number be x.Average = (55 + 30 + x)/3 = 45
85 + x = 45 × 3
85 + x = 135
x = 135 - 85
x = 50
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