The number of green and red stickers are equal.
If Adam gives away 90 green stickers and 40 red stickers,
the ratio of green stickers to red stickers becomes 4 : 9.
How many stickers are there at first?
|
Green |
Red |
Before |
4 u + 90 |
9 u + 40 |
Change |
- 90 |
- 40 |
After |
4 u |
9 u |
The number of green and red stickers is the same at first.
4 u + 90 = 9 u + 40
9 u - 4 u = 90 - 40
5 u = 50
1 u = 50 ÷ 5 = 10
Number of stickers that Adam has at first
= 4 u + 90 + 9 u + 40
= 4 u + 9 u + 90 + 40
= 13 u + 130
= 13 x 10 + 130
= 130 + 130
= 260
Answer(s): 260