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 blue stickers than green stickers.
He has 20 more red stickers than
the sum of the number of blue and green stickers.
- How many more red stickers than green stickers are there?
- How many less blue stickers than red stickers are there?
- 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 + 10
Number of green and blue stickers
= 1 u + 1 u + 10
= 2 u + 10
Number of red stickers
= 2 u + 10 + 20
= 2 u + 30
Number of more red stickers than green stickers
= (2 u + 30) - 1 u
= 2 u - 1 u + 30
= 1 u + 30
(b)
Number of less blue stickers than red stickers
= (2 u + 30) - (1 u + 10)
= 2 u + 30 - 1 u - 10
= 2 u - 1 u + 30 - 10
= 1 u + 20
(c)
Number of blue and red stickers
= 1 u + 10 + 2 u + 30
= 1 u + 2 u + 10 + 30
= 3 u + 40
Answer(s): (a) 1u + 30 ; (b) 1u + 20; (c) 3u + 40