The number of red and blue stickers are equal.
If Adam gives away 90 red stickers and 20 blue stickers,
the ratio of red stickers to blue stickers becomes 1 : 3.
How many stickers are there at first?
|
Red |
Blue |
Before |
1 u + 90 |
3 u + 20 |
Change |
- 90 |
- 20 |
After |
1 u |
3 u |
The number of red and blue stickers is the same at first.
1 u + 90 = 3 u + 20
3 u - 1 u = 90 - 20
2 u = 70
1 u = 70 ÷ 2 = 35
Number of stickers that Adam has at first
= 1 u + 90 + 3 u + 20
= 1 u + 3 u + 90 + 20
= 4 u + 110
= 4 x 35 + 110
= 140 + 110
= 250
Answer(s): 250