The number of red and green stickers are equal.
If Adam gives away 70 red stickers and 50 green stickers,
the ratio of red stickers to green stickers becomes 5 : 7.
How many stickers are there at first?
|
Red |
Green |
Before |
5 u + 70 |
7 u + 50 |
Change |
- 70 |
- 50 |
After |
5 u |
7 u |
The number of red and green stickers is the same at first.
5 u + 70 = 7 u + 50
7 u - 5 u = 70 - 50
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has at first
= 5 u + 70 + 7 u + 50
= 5 u + 7 u + 70 + 50
= 12 u + 120
= 12 x 10 + 120
= 120 + 120
= 240
Answer(s): 240