Problems on averages of average weights

Problems on averages of average weights

#### If a class of 30 students has an average weight of 50 kg, and a new student with a weight of 60 kg joins the class, what is the new average weight of the class? 1. [ ] 50 kg 2. [ ] 51 kg 3. [x] 50.3(approx) kg 4. [ ] 54 kg #### The average weight of three friends is 60 kg. If the first two friends weigh 50 kg and 65 kg, respectively, what is the weight of the third friend? 1. [x] 55 kg 2. [ ] 60 kg 3. [ ] 65 kg 4. [ ] 70 kg