The number of red and blue stickers are equal.
If Adam gives away 90 red stickers and 30 blue stickers,
the ratio of red stickers to blue stickers becomes 3 : 8.
How many stickers are there at first?
|
Red |
Blue |
Before |
3 u + 90 |
8 u + 30 |
Change |
- 90 |
- 30 |
After |
3 u |
8 u |
The number of red and blue stickers is the same at first.
3 u + 90 = 8 u + 30
8 u - 3 u = 90 - 30
5 u = 60
1 u = 60 ÷ 5 = 12
Number of stickers that Adam has at first
= 3 u + 90 + 8 u + 30
= 3 u + 8 u + 90 + 30
= 11 u + 120
= 11 x 12 + 120
= 132 + 120
= 252
Answer(s): 252