Adam has 900 red and green stickers.
He sells 80 red stickers and the number of green stickers becomes 4 times as many as red stickers.
- How many more green stickers than red stickers does Adam have at first?
- How many less red stickers than green stickers does Adam have in the end?
|
Red |
Green |
Before |
1 u + 80 |
4 u |
Change |
- 80 |
No Change |
After |
1 u |
4 u |
(a)
The number of green stickers remains unchanged.
Total number of stickers at first
= 1 u + 80 + 4 u
= 5 u + 80
5 u + 80 = 900
5 u = 900 - 80
5 u = 820
1 u = 820 ÷ 5 = 164
Number of more green stickers than red stickers at first
= 4 u - (1 u + 80)
= 4 u - 1 u - 80
= 3 u - 80
= 3 x 164 - 80
= 492 - 80
= 412
(b)
Number of less red stickers than green stickers in the end
= 4 u - 1 u
= 3 u
= 3 x 164
= 492
Answer(s): (a) 412; (b) 492