Adam has 200 stickers.
He has 50 less green stickers than blue stickers.
He has 60 less red stickers than green stickers.
How many less red stickers than blue and green stickers does Adam have?
Choose the smallest group to be 1 u.

Number of red stickers = 1 u
Number of green stickers = 1 u + 60
Number of blue stickers = 1 u + 60 + 50 = 1 u + 110

Total number of stickers
= 1 u + 1 u + 60 + 1 u + 110
= 3 u + 170

3 u + 170 = 200
3 u = 200 - 170
3 u = 30

1 u = 30 ÷ 3 = 10

Total number of blue and green stickers
= 1 u + 60 + 1 u + 110
= 2 u + 170

Number of less red stickers than blue and green stickers
= 2 u + 170 - 1 u
= 2 u - 1 u + 170
= 1 u + 170
= 10 + 170
= 180

Answer(s): 180