Algebra Q#9
0. Average of four numbers is 10.5. If three of these numbers be 4,9 and 13, find the fourth number.
- Option : A
- Explanation : Let fourth number be x. Average = Sum of numbers / Number of numbers ⇒ 10.5 = (4 + 9 + 13 + x) / 4 ⇒ 10.5 x 4 = 26 + x ⇒ 42-26=x ⇒ X= 16
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