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In a class of 56 students there are 21 girls. The average weight of these girls is 56 kg and average weight of the full class is 62.875 kg. What is the average weight of the boys of the class?
  • a)
    69.75 kg
  • b)
    72.5 kg
  • c)
    67 kg
  • d)
    65 kg
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In a class of 56 students there are 21 girls. The average weight of th...
Total weight of all students = 56 × 62.875 = 3521 kg
Total weight of girls = 21 × 56 = 1176 kg
Total weight of boys = 3521 – 1176 = 2345 kg
∴ Average weight of boys = 2345/(56 - 21) = 67 kg
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Most Upvoted Answer
In a class of 56 students there are 21 girls. The average weight of th...
Given information:
- Total number of students = 56
- Number of girls = 21
- Average weight of girls = 56 kg
- Average weight of the full class = 62.875 kg

To find: Average weight of the boys in the class

Let's solve this step by step:

Step 1: Find the total weight of the girls
- Total number of girls = 21
- Average weight of girls = 56 kg
- Total weight of the girls = 21 * 56 = 1176 kg

Step 2: Find the total weight of the class
- Average weight of the full class = 62.875 kg
- Total weight of the class = Average weight of the full class * Number of students
- Total weight of the class = 62.875 * 56 = 3522 kg

Step 3: Find the total weight of the boys
- Total weight of the class = Total weight of the girls + Total weight of the boys
- Total weight of the boys = Total weight of the class - Total weight of the girls
- Total weight of the boys = 3522 - 1176 = 2346 kg

Step 4: Find the average weight of the boys
- Number of boys = Total number of students - Number of girls
- Number of boys = 56 - 21 = 35
- Average weight of the boys = Total weight of the boys / Number of boys
- Average weight of the boys = 2346 / 35 = 67 kg

Therefore, the average weight of the boys in the class is 67 kg (option C).
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In a class of 56 students there are 21 girls. The average weight of these girls is 56 kg and average weight of the full class is 62.875 kg. What is the average weight of the boys of the class?a)69.75 kgb)72.5 kgc)67 kgd)65 kgCorrect answer is option 'C'. Can you explain this answer?
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In a class of 56 students there are 21 girls. The average weight of these girls is 56 kg and average weight of the full class is 62.875 kg. What is the average weight of the boys of the class?a)69.75 kgb)72.5 kgc)67 kgd)65 kgCorrect answer is option 'C'. Can you explain this answer? for Railways 2024 is part of Railways preparation. The Question and answers have been prepared according to the Railways exam syllabus. Information about In a class of 56 students there are 21 girls. The average weight of these girls is 56 kg and average weight of the full class is 62.875 kg. What is the average weight of the boys of the class?a)69.75 kgb)72.5 kgc)67 kgd)65 kgCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Railways 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a class of 56 students there are 21 girls. The average weight of these girls is 56 kg and average weight of the full class is 62.875 kg. What is the average weight of the boys of the class?a)69.75 kgb)72.5 kgc)67 kgd)65 kgCorrect answer is option 'C'. Can you explain this answer?.
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