Question : A group of students has an average weight of 42 kg. One student of weight 48 kg leaves the group and another student of weight 44 kg joins the group. If the new average weight becomes 41.6 kg, then how many students are there in the group?

Option 1: 15

Option 2: 10

Option 3: 8

Option 4: 12

Question : The average weight of 20 boxes of oranges is 2 kg, and the average weight of 30 boxes of mangoes is 3 kg. Find the average weight of these boxes of fruits, taken together.

Option 1: 2.6 kg

Option 2: 3.2 kg

Option 3: 1.8 kg

Option 4: 2.4 kg

Question : The average weight of A, B, and C is 40 kg. If the average weight of A and B is 35 kg and that of B and C is 31 kg, then what is the weight of B?

Option 1: 12 kg

Option 2: 50 kg

Option 3: 24 kg

Option 4: 36 kg

Question : A group of boys has an average weight of 42 kg. One boy weighing 48 kg leaves the group and another boy weighing 38 kg joins the group. If the average now becomes 41 kg, then how many boys are there in the group?

Option 1: 8

Option 2: 10

Option 3: 12

Option 4: 6

Question : The average weight of a group of 20 persons is 40 kg. The average weight of another group of 40 persons is K kg. If the average weight of all the 60 persons is 60 kg, then what is the value of K?

Option 1: 80

Option 2: 60

Option 3: 40

Option 4: 70