Adam has 700 green and blue stickers.
He buys 20 green stickers and the number of green stickers becomes 5 times as many as blue stickers.
- How many more green stickers than blue stickers does Adam have at first?
- How many less blue stickers than green stickers does Adam have in the end?
|
Green |
Blue |
Before |
5 u - 20 |
1 u |
Change |
+ 20 |
No change |
After |
5 u |
1 u |
(a)
The number of blue stickers remain unchanged.
Total number of stickers at first
= 1 u + 5 u - 20
= 6 u - 20
6 u - 20 = 700
6 u = 700 + 20
6 u = 720
1 u = 720 ÷ 6 = 120
Number of more green stickers than blue stickers at first
= (5 u - 20) - 1 u
= 5 u - 1 u - 20
= 4 u - 20
= 4 x 120 - 20
= 480 - 20
= 460
(b)
Number of less blue stickers than green stickers in the end
= 5 u - 1 u
= 4 u
= 4 x 120
= 480
Answer(s): (a) 460; (b) 480