Level 1
Adam has 1800 red stickers, 2400 blue stickers and 1200 yellow stickers.
After some stickers are given away,
Adam has 3000 stickers left.
How many stickers are given away?
Level 2
There are 100 boys and 200 girls in a school.
180 of them are Primary 1 pupils.
The rest are Primary 2 pupils.
How many Primary 2 pupils are there in the school?