Level 1
There are 3 boxes. The mass of Box A is 3.4 kg, the mass of Box B is 5.8 kg and the mass of Box C is 4.2 kg. Which box has its mass nearest to the average mass of the 3 boxes? Give the letter only for the answer.
Level 2
The average capacity of 3 containers is 35 ℓ. Given that the total capacity of two of the containers is 86 ℓ, what is the capacity of the third container?