Level 2
There were some children in a room. After 8 boys left the room and 15 girls entered the room, there were 51 children in the room. How many children were there in the room at first?
Level 2
A baker had some eggs to bake cakes. He broke 48 of the eggs and bought another 89 more. In the end, he had 365 eggs. How many eggs did he have at first?
Level 3
9 people queue up to buy tickets for a funfair. David is one of them. There are 3 people in front of him. How many people are there behind him?