Question 69
The average weight of a group consisting of 7 people is 55 kg. Two people with a total weight of 124 kg left the group and three people whose average weight is 61 kg joined the group. What is the new average weight of the group?
Solution
The total weight of the original group = 55 * 7 = 385 kg
Total weight of the people who left the group = 124 kg
Total weight of the people who joined the group = 61 * 3 = 183 kg
New total weight of the group = 385 - 124 + 183 = 444 kg
New average weight of the group = 444/8 = 55.5 kg
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