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

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

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

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

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

Number of blue stickers
= 2 u + 10 + 60
= 2 u + 70

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

(b)
Number of less green stickers than blue stickers
= (2 u + 70) - (1 u + 10)
= 2 u + 70 - 1 u - 10
= 2 u - 1 u + 70 - 10
= 1 u + 60

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

Answer(s): (a) 1u + 70 ; (b) 1u + 60; (c) 3u + 80