Adam has 600 red and green stickers.
He buys 90 red 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?
|
Red |
Green |
Before |
5 u - 90 |
1 u |
Change |
+ 90 |
No change |
After |
5 u |
1 u |
(a)
The number of green stickers remain unchanged.
Total number of stickers at first
= 1 u + 5 u - 90
= 6 u - 90
6 u - 90 = 600
6 u = 600 + 90
6 u = 690
1 u = 690 ÷ 6 = 115
Number of more red stickers than green stickers at first
= (5 u - 90) - 1 u
= 5 u - 1 u - 90
= 4 u - 90
= 4 x 115 - 90
= 460 - 90
= 370
(b)
Number of less green stickers than red stickers in the end
= 5 u - 1 u
= 4 u
= 4 x 115
= 460
Answer(s): (a) 370; (b) 460