Adam has 380 stickers.
After
15 of the green stickers and
20 red stickers are given away,
there is an equal number of green and red stickers left.
- How many green stickers are there in the end?
- How many more green stickers than red stickers are there at first?
- How many green stickers are given away?
|
Green stickers |
Red stickers |
Total |
Before |
5 u |
4 u + 20 |
380 |
Change |
- 1 u |
- 20 |
|
After |
4 u |
4 u |
|
(a)
Fraction of the green stickers left
= 1 -
15 =
45 Total number of stickers at first
= 5 u + 4 u + 20
= 9 u + 20
9 u + 20 = 380
9 u = 380 - 20
9 u = 360
1 u = 360 ÷ 9 = 40
Number of green stickers in the end
= 4 u
= 4 x 40
= 160
(b)
Number of more green stickers than red stickers at first
= 5 u - (4 u + 20)
= 5 u - 4 u - 20
= 1 u - 20
= 1 x 40 - 20
= 40 - 20
= 20
(c)
Number of green stickers given away
= 1 u
= 40
Answer(s): (a) 160; (b) 20; (c) 40