Arithmetic Aptitude Average

• A 54.68
• B 54.88
• C 34.58
• D 24.65
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A

Answer: A

The average marks of all the students is 54.68.
To find this, we can use the following steps:
The average marks of the three classes of 45, 60, and 55 students are 60, 55, and 50, respectively.
The total number of students in the three classes is 45 + 60 + 55 = 160.
The total marks of the three classes are 45 * 60 + 60 * 55 + 55 * 50 = 2700 + 3300 + 2750 = 8750.
Therefore, the average marks of all the students is 8750 / 160 = 54.68.

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