The number of blue and red stickers are equal.
If Adam gives away 70 blue stickers and 10 red stickers,
the ratio of blue stickers to red stickers becomes 2 : 5.
How many stickers are there at first?
|
Blue |
Red |
Before |
2 u + 70 |
5 u + 10 |
Change |
- 70 |
- 10 |
After |
2 u |
5 u |
The number of blue and red stickers is the same at first.
2 u + 70 = 5 u + 10
5 u - 2 u = 70 - 10
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has at first
= 2 u + 70 + 5 u + 10
= 2 u + 5 u + 70 + 10
= 7 u + 80
= 7 x 20 + 80
= 140 + 80
= 220
Answer(s): 220