The number of red and green stickers are equal.
If Adam gives away 40 red stickers and 30 green stickers,
the ratio of red stickers to green stickers becomes 2 : 7.
How many stickers are there at first?
|
Red |
Green |
Before |
2 u + 40 |
7 u + 30 |
Change |
- 40 |
- 30 |
After |
2 u |
7 u |
The number of red and green stickers is the same at first.
2 u + 40 = 7 u + 30
7 u - 2 u = 40 - 30
5 u = 10
1 u = 10 ÷ 5 = 2
Number of stickers that Adam has at first
= 2 u + 40 + 7 u + 30
= 2 u + 7 u + 40 + 30
= 9 u + 70
= 9 x 2 + 70
= 18 + 70
= 88
Answer(s): 88