Multiple choice

Passage

[CAT 1997] Directions for Questions 2 to 4: Answer the questions based on the following information. There are 60 students in a class. These students are divided into three groups A, B and C of 15, 20 and 25 students each. The groups A and C are combined to form group D.

What is the average weight of the students in group D?

  1. More than the average weight of A

  2. More than the average weight of C

  3. Less than the average weight of C

  4. Cannot be determined
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The average weight of group D depends on the individual weights of students in groups A and C. Since no information regarding the weights of the students is provided, the average cannot be determined.

AI explanation

To find the average age of the remaining 25 girls, first calculate the sum of the ages of the first two groups. The sum for the first 25 girls is 25 times 12, equaling 300 years, and the sum for the next 25 girls is 25 times 16, equaling 400 years. The total age of all 75 girls is 1050 years, so the sum of the ages of the remaining 25 girls is 1050 minus 300 minus 400, leaving 350 years. Dividing this 350 years by the 25 remaining girls gives an average age of 14 years.

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