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 1 : 4.
How many stickers are there at first?
|
Red |
Blue |
Before |
1 u + 90 |
4 u + 30 |
Change |
- 90 |
- 30 |
After |
1 u |
4 u |
The number of red and blue stickers is the same at first.
1 u + 90 = 4 u + 30
4 u - 1 u = 90 - 30
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has at first
= 1 u + 90 + 4 u + 30
= 1 u + 4 u + 90 + 30
= 5 u + 120
= 5 x 20 + 120
= 100 + 120
= 220
Answer(s): 220