5. In a group of 32 students, the average weight was 18.5 kg. When 4 students left the group, the average came down to 15.5 kg. What was the average weight (in kg) of those 4 students?
This questions was previously asked in
ssc cgl 2023 pre
Explanation:
- The initial total weight of 32 students is calculated as: 32 students × 18.5 kg/student = 592 kg.
- When 4 students leave, 28 students remain with an average weight of 15.5 kg.
- The total weight of the 28 students is: 28 students × 15.5 kg/student = 434 kg.
- The weight of the 4 students who left is calculated by subtracting the weight of the remaining 28 students from the original total weight: 592 kg - 434 kg = 158 kg.
- The average weight of the 4 students who left is then: 158 kg ÷ 4 = 39.5 kg.
The correct answer is Option 1: 39.5
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By: Parvesh Mehta