The number of green and blue stickers are equal.
If Adam gives away 40 green stickers and 30 blue stickers,
the ratio of green stickers to blue stickers becomes 1 : 3.
How many stickers are there at first?
|
Green |
Blue |
Before |
1 u + 40 |
3 u + 30 |
Change |
- 40 |
- 30 |
After |
1 u |
3 u |
The number of green and blue stickers is the same at first.
1 u + 40 = 3 u + 30
3 u - 1 u = 40 - 30
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has at first
= 1 u + 40 + 3 u + 30
= 1 u + 3 u + 40 + 30
= 4 u + 70
= 4 x 5 + 70
= 20 + 70
= 90
Answer(s): 90