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 70 less green stickers than blue stickers.
He has 150 less red stickers than
the sum of the number of green and blue stickers.

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

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

Number of green stickers = 1 u
Number of blue stickers = 1 u + 70

Number of blue and green stickers
= 1 u + 1 u + 70
= 2 u + 70

Number of red stickers
= 2 u + 70 - 150
= 2 u - 80

Number of more red stickers than blue stickers
= (2 u - 80) - (1 u + 70)
= 2 u - 80 - 1 u - 70
= 2 u - 1 u - 80 - 70
= 1 u - 150

(b)
Number of less green stickers than red stickers
= (2 u - 80) - 1 u
= 2 u - 80 - 1 u
= 2 u - 1 u - 80
= 1 u - 80

(c)
Number of blue and red stickers
= (1 u + 70) + (2 u - 80)
= 1 u + 2 u + 70 - 80
= 3 u - 10

Answer(s): (a) 1 u - 150; (b) 1 u - 80; (c) 3 u - 10