Multiple choice

A class has two section in one of which there are 40 students with an average age of 14.5 years. The average of the class is 14.2 years. If there are 32 students in the other section, then its average age is

  1. 13.7 years

  2. 13.6 years

  3. 13.5 years

  4. None of the above
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D Correct answer
AI explanation

The total age of the 40 students in the first section is 40 multiplied by 14.5, which equals 580 years. Assuming there are 72 students total in the class, the total age of the entire class is 72 multiplied by 14.2, which equals 1022.4 years. The total age of the 32 students in the second section is 1022.4 minus 580, giving 442.4 years. The average age of the second section is 442.4 divided by 32, which equals 13.825 years; therefore, none of the provided options match this result.

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