The number of blue and red stickers are equal.
If Adam gives away 80 blue stickers and 20 red stickers,
the ratio of blue stickers to red stickers becomes 4 : 7.
How many stickers are there at first?
|
Blue |
Red |
Before |
4 u + 80 |
7 u + 20 |
Change |
- 80 |
- 20 |
After |
4 u |
7 u |
The number of blue and red stickers is the same at first.
4 u + 80 = 7 u + 20
7 u - 4 u = 80 - 20
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has at first
= 4 u + 80 + 7 u + 20
= 4 u + 7 u + 80 + 20
= 11 u + 100
= 11 x 20 + 100
= 220 + 100
= 320
Answer(s): 320