Adam has 480 stickers.
After
13 of the blue stickers and
50 green stickers are given away,
there is an equal number of blue and green stickers left.
- How many blue stickers are there in the end?
- How many more blue stickers than green stickers are there at first?
- How many blue stickers are given away?
|
Blue stickers |
Green stickers |
Total |
Before |
3 u |
2 u + 50 |
480 |
Change |
- 1 u |
- 50 |
|
After |
2 u |
2 u |
|
(a)
Fraction of the blue stickers left
= 1 -
13 =
23 Total number of stickers at first
= 3 u + 2 u + 50
= 5 u + 50
5 u + 50 = 480
5 u = 480 - 50
5 u = 430
1 u = 430 ÷ 5 = 86
Number of blue stickers in the end
= 2 u
= 2 x 86
= 172
(b)
Number of more blue stickers than green stickers at first
= 3 u - (2 u + 50)
= 3 u - 2 u - 50
= 1 u - 50
= 1 x 86 - 50
= 86 - 50
= 36
(c)
Number of blue stickers given away
= 1 u
= 86
Answer(s): (a) 172; (b) 36; (c) 86