The number of red and blue stickers are equal.
If Adam gives away 40 red stickers and 30 blue stickers,
the ratio of red stickers to blue stickers becomes 4 : 9.
How many stickers are there at first?
|
Red |
Blue |
Before |
4 u + 40 |
9 u + 30 |
Change |
- 40 |
- 30 |
After |
4 u |
9 u |
The number of red and blue stickers is the same at first.
4 u + 40 = 9 u + 30
9 u - 4 u = 40 - 30
5 u = 10
1 u = 10 ÷ 5 = 2
Number of stickers that Adam has at first
= 4 u + 40 + 9 u + 30
= 4 u + 9 u + 40 + 30
= 13 u + 70
= 13 x 2 + 70
= 26 + 70
= 96
Answer(s): 96