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
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Correct Answer: 2.6 kg
Solution : Average weight = $\frac{\text{Sum of values}}{\text{Total values}}$ Total weight of oranges = 20 × 2 = 40 Total weight of Mango = 30 × 3 = 90 Total number of boxes = 30 + 20 = 50 Average weight = $\frac{90 + 40}{50}$ ⇒ Average weight = $\frac{130}{50}$ = 2.6 kg Hence, the correct answer is 2.6 kg.
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Question : The average weight of 9 boxes is 61 kg. If three boxes having an average weight of 70 kg are removed, then what will be the new average weight of the remaining boxes?
Option 1: 55.5 kg
Option 2: 54 kg
Option 3: 56.5 kg
Option 4: 45.5 kg
Question : In a class, the average weight of 4 boys is 50 kg and the average weight of 4 girls is 40 kg. What is the average weight of all the 8 students taken together?
Option 1: 44 kg
Option 2: 48 kg
Option 3: 45 kg
Option 4: 42 kg
Question : The average weight of six persons is 30 kg. If a new person joins this group, then the average weight becomes 28 kg. What is the weight of the new person?
Option 1: 22 kg
Option 2: 14 kg
Option 3: 15 kg
Option 4: 16 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 : The average weight of the 25 members of the group is 39 kg. The average weight of 27 members of another group is 21 kg. What will be the total weight of the members of both groups?
Option 1: 1426 kg
Option 2: 1542 kg
Option 3: 1507 kg
Option 4: 1714 kg
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