The number of red and blue stickers are equal.
If Adam gives away 80 red stickers and 20 blue stickers,
the ratio of red stickers to blue stickers becomes 5 : 8.
How many stickers are there at first?
|
Red |
Blue |
Before |
5 u + 80 |
8 u + 20 |
Change |
- 80 |
- 20 |
After |
5 u |
8 u |
The number of red and blue stickers is the same at first.
5 u + 80 = 8 u + 20
8 u - 5 u = 80 - 20
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has at first
= 5 u + 80 + 8 u + 20
= 5 u + 8 u + 80 + 20
= 13 u + 100
= 13 x 20 + 100
= 260 + 100
= 360
Answer(s): 360