The number of blue and red stickers are equal.
If Adam gives away 60 blue stickers and 50 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 + 60 |
7 u + 50 |
Change |
- 60 |
- 50 |
After |
2 u |
7 u |
The number of blue and red stickers is the same at first.
2 u + 60 = 7 u + 50
7 u - 2 u = 60 - 50
5 u = 10
1 u = 10 ÷ 5 = 2
Number of stickers that Adam has at first
= 2 u + 60 + 7 u + 50
= 2 u + 7 u + 60 + 50
= 9 u + 110
= 9 x 2 + 110
= 18 + 110
= 128
Answer(s): 128