Question 7
The beavers have the water system illustrated below. Each bucket can hold at most the amount written on it, except M and N. All remaining water reaching a bucket is split equally between its outgoing branches and continues downward. At the end, the top bucket S holds no water; M and N hold 80 and 40 litres respectively; the other buckets are full at their capacities, respectively 40,20 and 20 litres.

The beavers build another system as below and pour 200 litres through S.

Initially all buckets are empty and no water spills outside the system while flowing. When the water stops flowing, how many litres are in A?

The beavers build another system as below and pour 200 litres through S.

Initially all buckets are empty and no water spills outside the system while flowing. When the water stops flowing, how many litres are in A?