A group of 6 people has an average weight of 70 kg. If one person weighing 80 kg leaves, what is the new average weight?
Practice Questions
1 question
Q1
A group of 6 people has an average weight of 70 kg. If one person weighing 80 kg leaves, what is the new average weight?
68
69
70
71
The total weight of the group is 6 * 70 = 420 kg. After the 80 kg person leaves, the total weight becomes 420 - 80 = 340 kg. The new average is 340 / 5 = 68 kg.
Questions & Step-by-step Solutions
1 item
Q
Q: A group of 6 people has an average weight of 70 kg. If one person weighing 80 kg leaves, what is the new average weight?
Solution: The total weight of the group is 6 * 70 = 420 kg. After the 80 kg person leaves, the total weight becomes 420 - 80 = 340 kg. The new average is 340 / 5 = 68 kg.
Steps: 3
Step 1: Calculate the total weight of the group. Since the average weight is 70 kg and there are 6 people, multiply 70 by 6. So, 70 * 6 = 420 kg.
Step 2: One person weighing 80 kg leaves the group. To find the new total weight, subtract 80 kg from the previous total weight. So, 420 kg - 80 kg = 340 kg.
Step 3: Now, there are 5 people left in the group. To find the new average weight, divide the new total weight (340 kg) by the number of people left (5). So, 340 kg / 5 = 68 kg.
