There are 30 students in a class. The average weight of 12 students is 40 kg and the average weight of the remaining 18 students is 42 kg each. Then, the average weight of all the students is:
*41.2 kg
*41.4 kg
*41.7 kg
*41.9 kg
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2
Answer:
Step-by-step explanation: Average weight of a class of 29 students = 40 kg, average rises by 500 gm. To calculate the weight of the teacher follows the steps. Total weight of 29 students =29×40=1160 kg, total weight of student and teacher =30×40.5=1215 kg and weight of teacher = 1215-1160=55 kg
Answered by
4
Answer:
Total weight of all students in the class = (12 * 40) + (18 * 42) = 1236 kgs
Therefore, average weight = 1236 / 30 = 41.2 kgs
Answer = 41.2 kgs
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