To solve this problem, we need to follow these steps:

1. First, we need to calculate the total weight of the class after the changes. This is done by multiplying the new average weight by the total number of people in the class. So, 69 kg (new average weight) * 60 people (new total number of people) = 4140 kg.

2. Then, we need to subtract the weight of the 3 new people who joined the class. So, 4140 kg - 70 kg - 77 kg - 68 kg = 3925 kg.

3. Now, we need to add back the weight of the 7 people who left the class. So, 3925 kg + 7 people * 61 kg (average weight of the people who left) = 4257 kg.

4. Finally, we can find the original average weight of the class by dividing the total weight by the original number of people. So, 4257 kg / 64 people = 66.515625 kg.

So, the original average weight of the class of 64 people was approximately 67 kg.

Question

To solve this problem, we need to follow these steps:

1. First, we need to calculate the total weight of the class after the changes. This is done by multiplying the new average weight by the total number of people in the class. So, 69 kg (new average weight) * 60 people (new total number of people) = 4140 kg.

2. Then, we need to subtract the weight of the 3 new people who joined the class. So, 4140 kg - 70 kg - 77 kg - 68 kg = 3925 kg.

3. Now, we need to add back the weight of the 7 people who left the class. So, 3925 kg + 7 people * 61 kg (average weight of the people who left) = 4257 kg.

4. Finally, we can find the original average weight of the class by dividing the total weight by the original number of people. So, 4257 kg / 64 people = 66.515625 kg.

So, the original average weight of the class of 64 people was approximately 67 kg.

Knowee AI · Accepted Answer

To solve this problem, we need to follow these steps:

1. First, we need to calculate the total weight of the class after the changes. This is done by multiplying the new average weight by the total number of people in the class. So, 69 kg (new average weight) * 60 people (new total number of people) = 4140 kg.

2. Then, we need to subtract the weight of the 3 new people who joined the class. So, 4140 kg - 70 kg - 77 kg - 68 kg = 3925 kg.

3. Now, we need to add back the weight of the 7 people who left the class. So, 3925 kg + 7 people * 61 kg (average weight of the people who left) = 4257 kg.

4. Finally, we can find the original average weight of the class by dividing the total weight by the original number of people. So, 4257 kg / 64 people = 66.515625 kg.

So, the original average weight of the class of 64 people was approximately 67 kg.

Out of a class of 64 people ,7 people of average weight 61 kg leave, and immediately 3 people weighing 70kg ,77 kg and 68 kg join. there by making the new average weight of the class 69 kg. What was the original average weight of the class of 64 people?Options7068905967

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