The number of green and red stickers are equal.
If Adam gives away 30 green stickers and 10 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 + 30 |
7 u + 10 |
Change |
- 30 |
- 10 |
After |
3 u |
7 u |
The number of green and red stickers is the same at first.
3 u + 30 = 7 u + 10
7 u - 3 u = 30 - 10
4 u = 20
1 u = 20 ÷ 4 = 5
Number of stickers that Adam has at first
= 3 u + 30 + 7 u + 10
= 3 u + 7 u + 30 + 10
= 10 u + 40
= 10 x 5 + 40
= 50 + 40
= 90
Answer(s): 90