Question : The average weight of a team of 20 people was calculated to be 59.8 kg and it was later discovered that one weight was misread as 68 kg instead of 77 kg. The correct average weight is:

Option 1: 70.25 kg

Option 2: 61.25 kg

Option 3: 60.25 kg

Option 4: 60.50 kg

Question : In a class of 60 students, there are 35 boys. The average weight of boys is 42 kg and the average weight of the full class is 46.5 kg. Find the average weight of girls in the class.

Option 1: 48.7 kg

Option 2: 49.7 kg

Option 3: 52.8 kg

Option 4: 56.7 kg

Question : There are 15 students in a class. Their average weight is 40 kg. When one student leaves the class, the average weight is 39.5 kg. What is the weight of the student who left the class (where kg means kilogram)?

Option 1: 47 kg

Option 2: 42 kg

Option 3: 52 kg

Option 4: 48 kg

Question : In a class of 60 students, 20 are girls. The average weight of the boys in the class is 40 kg, while that of all the girls is 35 kg. What is the average weight (in kg) of the entire class (correct to two decimal places)?

Option 1: 36.67

Option 2: 38.33

Option 3: 33.33

Option 4: 40.67

Question : The average of a, b, and c is 20, and that of b, c, and d is 25. If d = 30, then the value of a is:

Option 1: 25

Option 2: 45

Option 3: 30

Option 4: 15