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Doctors Medicines MCQs Q&A

  1. 0.14 kg
  2. 1 kg
  3. 0.5 kg
  4. 1.5 kg
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1 Answers

Option 1 : 0.14 kg

Average = Sum of elements/Number of elements

Given,

Total weight of 20 boys in a bus = 20 × 22.5 = 450 kg

Total weight of 25 girls in a bus = 25 × 18 = 450 kg

Total weight of 45 students in a bus = 450 + 450 = 900 kg

Average weight of 45 students = 900/45 = 20 kg

Weight of  the driver = 20 × 3 = 60 kg

Average weight of bus including old driver = (900 + 60) / (45 + 1) = 20.86 kg

Weight of new driver = 60 + 6 = 66 kg

Average weight of bus including new driver = (900 + 66) / (45 + 1) = 21 kg

Change in the average weight of the bus = 0.14 kg
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Related Questions

Questions below followed by three quantities. Find the relationship between them. Quantity I: In a class with a certain number of students if a teacher weighing 78 kg is added, then average weight of class is increased by 2 kg. If one more teacher weighing 66 kg is added, then the average weight of the class increases by 3.5 kg over the original average. What is the original average weight (in kg) of the class Quantity II: The average age of 16 students and their teacher's age is 16 years. If the teacher's age is excluded, the average reduces by 2. What is the teacher's age Quantity III: Average weight of three friends A, B and C is 46 kg. Another person D joins the group and now the average is 45 kg. If another person E whose weight is 6 kg more than D, joins the group replacing A, then average weight of B, C, D and E becomes 47 kg. What is the weight of A (in kg)?
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