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 2 : 5.
How many stickers are there at first?
|
Red |
Blue |
Before |
2 u + 90 |
5 u + 30 |
Change |
- 90 |
- 30 |
After |
2 u |
5 u |
The number of red and blue stickers is the same at first.
2 u + 90 = 5 u + 30
5 u - 2 u = 90 - 30
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has at first
= 2 u + 90 + 5 u + 30
= 2 u + 5 u + 90 + 30
= 7 u + 120
= 7 x 20 + 120
= 140 + 120
= 260
Answer(s): 260