Question : Find the average of the first fifteen multiples of 11.
Option 1: 55
Option 2: 35.5
Option 3: 88
Option 4: 77
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Correct Answer: 88
Solution : The first fifteen multiples of 11 are 11, 22, 33,..., 165. The average of an arithmetic series is the average of the first and last term. Average = $\frac{\text{First term + Last term}}{2} = \frac{11 + 165}{2}$ = 88 Hence, the correct answer is 88.
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Question : What is the average of the first five multiples of 11?
Option 1: 11
Option 2: 55
Option 3: 33
Option 4: 22
Question : What is the Highest Common Factor of $\frac{4}{55}$, $\frac{2}{11}$, and $\frac{8}{22}$?
Option 1: $\frac{1}{66}$
Option 2: $\frac{3}{88}$
Option 3: $\frac{2}{55}$
Option 4: $\frac{1}{55}$
Question : The average of 4 consecutive numbers is 35.5. Find the highest number among these numbers.
Option 1: 37
Option 2: 36
Option 3: 40
Option 4: 39
Question : LCM of $\frac{5}{33},\frac{25}{11},\frac{20}{55},$ and $\frac{15}{77}$ is:
Option 1: $\frac{300}{11}$
Option 2: $\frac{300}{77}$
Option 3: $\frac{25}{33}$
Option 4: $\frac{500}{11}$
Question : What is the average of the first 10 even numbers?
Option 1: 12
Option 2: 10
Option 3: 13
Option 4: 11
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