Adam has 800 green and red stickers.
He sells 80 green stickers and the number of red stickers becomes 5 times as many as green stickers.
- How many more red stickers than green stickers does Adam have at first?
- How many less green stickers than red stickers does Adam have in the end?
|
Green |
Red |
Before |
1 u + 80 |
5 u |
Change |
- 80 |
No Change |
After |
1 u |
5 u |
(a)
The number of red stickers remains unchanged.
Total number of stickers at first
= 1 u + 80 + 5 u
= 6 u + 80
6 u + 80 = 800
6 u = 800 - 80
6 u = 720
1 u = 720 ÷ 6 = 120
Number of more red stickers than green stickers at first
= 5 u - (1 u + 80)
= 5 u - 1 u - 80
= 4 u - 80
= 4 x 120 - 80
= 480 - 80
= 400
(b)
Number of less green stickers than red stickers in the end
= 5 u - 1 u
= 4 u
= 4 x 120
= 480
Answer(s): (a) 400; (b) 480