Adam has 300 stickers.
After
14 of the blue stickers and
20 red stickers are given away,
there is an equal number of blue and red stickers left.
- How many blue stickers are there in the end?
- How many more blue stickers than red stickers are there at first?
- How many blue stickers are given away?
|
Blue stickers |
Red stickers |
Total |
Before |
4 u |
3 u + 20 |
300 |
Change |
- 1 u |
- 20 |
|
After |
3 u |
3 u |
|
(a)
Fraction of the blue stickers left
= 1 -
14 =
34 Total number of stickers at first
= 4 u + 3 u + 20
= 7 u + 20
7 u + 20 = 300
7 u = 300 - 20
7 u = 280
1 u = 280 ÷ 7 = 40
Number of blue stickers in the end
= 3 u
= 3 x 40
= 120
(b)
Number of more blue stickers than red stickers at first
= 4 u - (3 u + 20)
= 4 u - 3 u - 20
= 1 u - 20
= 1 x 40 - 20
= 40 - 20
= 20
(c)
Number of blue stickers given away
= 1 u
= 40
Answer(s): (a) 120; (b) 20; (c) 40