Fill in the blanks.
For (a) to (c), give the answers in units (Eg 1 u) or unit equations (Eg 1 u + 2).

Adam has some stickers.
He has 50 more blue stickers than red stickers.
He has 80 more green stickers than
the sum of  the number of blue and red stickers.

1. How many more green stickers than red stickers are there?
2. How many less blue stickers than green stickers are there?
3. How many blue and green stickers are there?

(a)
Choose the smallest group to be 1 u.

Number of red stickers = 1 u
Number of blue stickers = 1 u + 50

Number of red and blue stickers
= 1 u + 1 u + 50
= 2 u + 50

Number of green stickers
= 2 u + 50 + 80
= 2 u + 130

Number of more green stickers than red stickers
= (2 u + 130) - 1 u
= 2 u - 1 u + 130
= 1 u + 130

(b)
Number of less blue stickers than green stickers
= (2 u + 130) - (1 u + 50)
= 2 u + 130 - 1 u - 50
= 2 u - 1 u + 130 - 50
= 1 u + 80

(c)
Number of blue and green stickers
= 1 u + 50 + 2 u + 130
= 1 u + 2 u + 50 + 130
= 3 u + 180

Answer(s): (a) 1u + 130 ; (b) 1u + 80; (c) 3u + 180