The number of green and red stickers are equal.
If Adam gives away 60 green stickers and 40 red stickers,
the ratio of green stickers to red stickers becomes 3 : 7.
How many stickers are there at first?
|
Green |
Red |
Before |
3 u + 60 |
7 u + 40 |
Change |
- 60 |
- 40 |
After |
3 u |
7 u |
The number of green and red stickers is the same at first.
3 u + 60 = 7 u + 40
7 u - 3 u = 60 - 40
4 u = 20
1 u = 20 ÷ 4 = 5
Number of stickers that Adam has at first
= 3 u + 60 + 7 u + 40
= 3 u + 7 u + 60 + 40
= 10 u + 100
= 10 x 5 + 100
= 50 + 100
= 150
Answer(s): 150