The number of blue and green stickers are equal.
If Adam gives away 60 blue stickers and 20 green stickers,
the ratio of blue stickers to green stickers becomes 3 : 7.
How many stickers are there at first?
|
Blue |
Green |
Before |
3 u + 60 |
7 u + 20 |
Change |
- 60 |
- 20 |
After |
3 u |
7 u |
The number of blue and green stickers is the same at first.
3 u + 60 = 7 u + 20
7 u - 3 u = 60 - 20
4 u = 40
1 u = 40 ÷ 4 = 10
Number of stickers that Adam has at first
= 3 u + 60 + 7 u + 20
= 3 u + 7 u + 60 + 20
= 10 u + 80
= 10 x 10 + 80
= 100 + 80
= 180
Answer(s): 180