Question : The average weight of 10 boys is increased by 3kg if one of them weighing 40 kg is replaced by a new boy. The weight of the new boy is:
Option 1: 45 kg
Option 2: 70 kg
Option 3: 80 kg
Option 4: 40 kg
New: SSC MTS 2024 Application Form OUT; Direct Link
Don't Miss: Month-wise Current Affairs | Upcoming Government Exams
New: Unlock 10% OFF on PTE Academic. Use Code: 'C360SPL10'
Correct Answer: 70 kg
Solution : Let the average weight of 10 boys be $x$. The sum of weights of 10 boys = $10x$ New average weight = $x+3$ New sum of weights = $10(x+3) = 10x+30$ Let the weight of the new boy be $y$. So, $10x-40+y=10x+30$ ⇒ $y=30+40=70$ Hence, the correct answer is 70 kg.
Application | Cutoff | Selection Process | Preparation Tips | Eligibility | Exam Pattern | Admit Card
Question : A group of boys has an average weight of 42 kg. One boy weighing 48 kg leaves the group and another boy weighing 38 kg joins the group. If the average now becomes 41 kg, then how many boys are there in the group?
Question : In a class, the average weight of 4 boys is 50 kg and the average weight of 4 girls is 40 kg. What is the average weight of all the 8 students taken together?
Question : The average weight of a group of 20 persons is 40 kg. The average weight of another group of 40 persons is K kg. If the average weight of all the 60 persons is 60 kg, then what is the value of K?
Question : The average weight of 25 students in a class is 50 kg. If the weight of the class teacher is included, the average is increased by 1 kg. The weight of the teacher is:
Question : The average weight of 9 boxes is 61 kg. If three boxes having an average weight of 70 kg are removed, then what will be the new average weight of the remaining boxes?
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile