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 2 : 7.
How many stickers are there at first?
|
Blue |
Red |
Before |
2 u + 80 |
7 u + 20 |
Change |
- 80 |
- 20 |
After |
2 u |
7 u |
The number of blue and red stickers is the same at first.
2 u + 80 = 7 u + 20
7 u - 2 u = 80 - 20
5 u = 60
1 u = 60 ÷ 5 = 12
Number of stickers that Adam has at first
= 2 u + 80 + 7 u + 20
= 2 u + 7 u + 80 + 20
= 9 u + 100
= 9 x 12 + 100
= 108 + 100
= 208
Answer(s): 208