Level 2
Fill in the blanks.
Adam has 20 stickers more than Bryan and
Chris has 10 stickers less than Adam.
Let the number of stickers that Bryan has be 1 u.
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?