Question

The average weight of 5 quantities is 10 kg and the average weight of 3 of them is 9 kg. What is the average weight of the remaining 2?

• A. 6 kg
• B. 6.5 kg
• C. 7 kg
• D. 6.25 kg

Hint:

Use the formula: Total = Average × Count, then subtract known group and divide remaining total.

Answer 1

The Correct Option is B

Total of all 5 = \( 5 \times 10 = 50 \) kg
Total of 3 known = \( 3 \times 9 = 27 \) kg
Remaining weight = \( 50 - 27 = 23 \) kg
Average of remaining 2 = \( \frac{23}{2} = \boxed{6.5 \text{ kg}} \)