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

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

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

Number of blue stickers = 1 u
Number of green stickers = 1 u + 10

Number of green and blue stickers
= 1 u + 1 u + 10
= 2 u + 10

Number of red stickers
= 2 u + 10 - 70
= 2 u - 60

Number of more red stickers than green stickers
= (2 u - 60) - (1 u + 10)
= 2 u - 60 - 1 u - 10
= 2 u - 1 u - 60 - 10
= 1 u - 70

(b)
Number of less blue stickers than red stickers
= (2 u - 60) - 1 u
= 2 u - 60 - 1 u
= 2 u - 1 u - 60
= 1 u - 60

(c)
Number of green and red stickers
= (1 u + 10) + (2 u - 60)
= 1 u + 2 u + 10 - 60
= 3 u - 50

Answer(s): (a) 1 u - 70; (b) 1 u - 60; (c) 3 u - 50