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 40 more red stickers than blue stickers.
He has 60 more green stickers than
the sum of  the number of red and blue stickers.

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

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

Number of blue stickers = 1 u
Number of red stickers = 1 u + 40

Number of blue and red stickers
= 1 u + 1 u + 40
= 2 u + 40

Number of green stickers
= 2 u + 40 + 60
= 2 u + 100

Number of more green stickers than blue stickers
= (2 u + 100) - 1 u
= 2 u - 1 u + 100
= 1 u + 100

(b)
Number of less red stickers than green stickers
= (2 u + 100) - (1 u + 40)
= 2 u + 100 - 1 u - 40
= 2 u - 1 u + 100 - 40
= 1 u + 60

(c)
Number of red and green stickers
= 1 u + 40 + 2 u + 100
= 1 u + 2 u + 40 + 100
= 3 u + 140

Answer(s): (a) 1u + 100 ; (b) 1u + 60; (c) 3u + 140