Level 2
A pitcher can hold 2 ℓ of water. Peter needs 5 pitchers of water to fill a pail completely. How many ℓ of water does he need to fill two pails completely?
Level 2
Beaker A had 3 ℓ of water at first. Andy poured some water from beaker B to A until beaker A is filled with 5 ℓ of water. There were 4 ℓ of water left in beaker B. How many litres of water were there in beaker B at first?