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?
Level 3
Carol had 18 stickers at first. After Betty gave her some stickers, Carol had 126 stickers. If Betty had 159 stickers left, how many stickers did Betty have at first?
Level 3
A fruit seller had 750 durians and 540 watermelons. After selling some durians and watermelons, he had 523 durians and 225 watermelons left. What was the total number of fruits sold?
Level 2
There are 5 pupils on my left.
There are 6 pupils on my right.
There are 7 pupils in front of me.
There are 8 pupils behind me.
How many pupils are there altogether?
