The number of red and green stickers are equal.
If Adam gives away 40 red stickers and 10 green stickers,
the ratio of red stickers to green stickers becomes 4 : 9.
How many stickers are there at first?
|
Red |
Green |
Before |
4 u + 40 |
9 u + 10 |
Change |
- 40 |
- 10 |
After |
4 u |
9 u |
The number of red and green stickers is the same at first.
4 u + 40 = 9 u + 10
9 u - 4 u = 40 - 10
5 u = 30
1 u = 30 ÷ 5 = 6
Number of stickers that Adam has at first
= 4 u + 40 + 9 u + 10
= 4 u + 9 u + 40 + 10
= 13 u + 50
= 13 x 6 + 50
= 78 + 50
= 128
Answer(s): 128