The number of blue and red stickers are equal.
If Adam gives away 80 blue stickers and 30 red stickers,
the ratio of blue stickers to red stickers becomes 5 : 7.
How many stickers are there at first?
|
Blue |
Red |
Before |
5 u + 80 |
7 u + 30 |
Change |
- 80 |
- 30 |
After |
5 u |
7 u |
The number of blue and red stickers is the same at first.
5 u + 80 = 7 u + 30
7 u - 5 u = 80 - 30
2 u = 50
1 u = 50 ÷ 2 = 25
Number of stickers that Adam has at first
= 5 u + 80 + 7 u + 30
= 5 u + 7 u + 80 + 30
= 12 u + 110
= 12 x 25 + 110
= 300 + 110
= 410
Answer(s): 410