Adam has 200 stickers.
He has 20 less blue stickers than red stickers.
He has 60 less green stickers than blue stickers.
How many less green stickers than red and blue stickers does Adam have?
Choose the smallest group to be 1 u.

Number of green stickers = 1 u
Number of blue stickers = 1 u + 60
Number of red stickers = 1 u + 60 + 20 = 1 u + 80

Total number of stickers
= 1 u + 1 u + 60 + 1 u + 80
= 3 u + 140

3 u + 140 = 200
3 u = 200 - 140
3 u = 60

1 u = 60 ÷ 3 = 20

Total number of red and blue stickers
= 1 u + 60 + 1 u + 80
= 2 u + 140

Number of less green stickers than red and blue stickers
= 2 u + 140 - 1 u
= 2 u - 1 u + 140
= 1 u + 140
= 20 + 140
= 160

Answer(s): 160