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In a class of 55 students there are 34 girls.The average weight of these girls is 51 kg and average weight of the full class is 55.2 kg. What is the average weight of the boys of the class?
  • a)
    62
  • b)
    59.4
  • c)
    56.8
  • d)
    60
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
In a class of 55 students there are 34 girls.The average weight of the...
Let the average weight of the boys be x kg.
In a class of 55 students there are 34 girls.
So, no. of boys = 55 – 34 = 21
The average weight of these girls is 51 kg and average weight of the full class is 55.2 kgs.
So, we can write now,
(51 × 34) + (21 × x) = 55 × 55.2
⇒ 1734 + 21x = 3036
⇒ 21x = 1302
⇒ x = 62
∴ The average weight of the boys = 62 kg
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In a class of 55 students there are 34 girls.The average weight of these girls is 51 kg and average weight of the full class is 55.2 kg. What is the average weight of the boys of the class?a)62b)59.4c)56.8d)60Correct answer is option 'A'. Can you explain this answer?
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In a class of 55 students there are 34 girls.The average weight of these girls is 51 kg and average weight of the full class is 55.2 kg. What is the average weight of the boys of the class?a)62b)59.4c)56.8d)60Correct answer is option 'A'. 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 55 students there are 34 girls.The average weight of these girls is 51 kg and average weight of the full class is 55.2 kg. What is the average weight of the boys of the class?a)62b)59.4c)56.8d)60Correct answer is option 'A'. 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 55 students there are 34 girls.The average weight of these girls is 51 kg and average weight of the full class is 55.2 kg. What is the average weight of the boys of the class?a)62b)59.4c)56.8d)60Correct answer is option 'A'. Can you explain this answer?.
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