The average weight of a group of 10 persons was 16 kg. When a person, having a weight of 15 kg was replaced by another person, it became 18 kg. Find the weight of the newly included person.
1.39 kg
4. 30 kg
2. 35 kg
5. 28 kg
3. 20 kg
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1 person = 16kg
10 persons = 160kg
160-15 = 145kg
We need 18kg for one person 180kg for 10 persons
180-145= 35kg
hence proved
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