Level 3
Don and Tom shared 420 stamps. Don got 3 times as many stamps as Tom. How many stamps must Don give Tom so that both of them would have an equal number of stamps?
Level 3
There were an equal number of pupils in classes 1X and 1Y. After 8 pupils transferred from Class 1X to Class 1Y, there are now 38 pupils in Class 1Y. How many pupils were there in each class at first?