Level 3
There were 28 more students in Group A than in Group B. If 9 students transferred from Group A to Group B, how many more students would be in Group A than in Group B?
Level 3
Peter and Oscar had 180 stickers altogether. After Peter gave 21 stickers to Oscar, Peter had 3 times as many stickers as Oscar. How many stickers did Oscar have at first?
Level 3
Bus A and Bus B had a total of 180 passengers. When 16 passengers from Bus A moved to Bus B, Bus A had 4 times as many passengers as Bus B. How many passengers were there in Bus B at first?