Question : The average weight of 8 students is 48 kg. If four students with an average weight of 44 kg and four with an average weight of 58 kg are also added, then find the average weight of 16 students.
Option 1: 49.5 kg
Option 2: 48 kg
Option 3: 49 kg
Option 4: 48.5 kg
Correct Answer: 49.5 kg
Solution : The average weight of 8 students = 48 kg Sum of the weights of 8 students = 48 × 8 = 384 kg The average weight of 4 students = 44 kg Sum of the weights of 4 students = 44 × 4 = 176 kg The average weight of another 4 students = 58 kg Sum of the weights of 4 students = 58 × 4 = 232 kg Sum of the weights of 16 students = 384 + 176 + 232 = 792 kg The average weight of 16 students = $\frac{\text{Sum of the weights of 16 students}}{\text{Total students}}=\frac{792}{16}= 49.5$ Hence, the correct answer is 49.5 kg.
Result | Eligibility | Application | Selection Process | Cutoff | Admit Card | Preparation Tips
Question : The average weight of 49 students is 53 kg. When a new student is admitted to the class, the average decreases by 500 g. Find the weight of the new student.
Question : The average weight of some students in a class was 60.5 kg. When 8 students, whose average weight was 65 kg, joined the class, then the average weight of all the students increased by 0.9 kg. The number of students in the class, initially, was:
Question : The average weight of A, B, and C is 65 kg. If the average weight of C and B is 61.5 kg, and the average weight of A and C is 68.5 kg, then the weight of C (in kg) is:
Question : The average weight of A, B and C is 65 kg. If the average weight of A and B is 63.5 kg, and the average weight of A and C is 67.5 kg, then the weight of A (in kg) is:
Question : There are 50 students in a class with an average weight of 45 kg. When one student leaves the class, the average weight reduces by 100 g. What is the weight of the student who left the class?
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile