The average weight of 16 containers is 80 kg. If 8 new containers are added, the new average increases by 2.5 kg. The average weight of the 8 new containers is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 87.5 kg.
Average weight of 16 containers = 80 kg
Total weight of 16 containers = 16 × 80 = 1280 kg
New average after adding 8 containers = 80 + 2.5 = 82.5 kg
Total number of containers = 16 + 8 = 24
Total weight of 24 containers = 24 × 82.5 = 1980 kg
Weight of 8 new containers = 1980 − 1280 = 700 kg
Average weight of 8 new containers = 700 ÷ 8 = 87.5 kg