The number of blue and red stickers are equal.
If Adam gives away 40 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 + 40 |
7 u + 20 |
Change |
- 40 |
- 20 |
After |
2 u |
7 u |
The number of blue and red stickers is the same at first.
2 u + 40 = 7 u + 20
7 u - 2 u = 40 - 20
5 u = 20
1 u = 20 ÷ 5 = 4
Number of stickers that Adam has at first
= 2 u + 40 + 7 u + 20
= 2 u + 7 u + 40 + 20
= 9 u + 60
= 9 x 4 + 60
= 36 + 60
= 96
Answer(s): 96