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

Number of blue stickers = 1 u
Number of red stickers = 1 u + 60
Number of green 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 green and red stickers
= 1 u + 60 + 1 u + 80
= 2 u + 140

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

Answer(s): 160