The number of blue and red stickers are equal.
If Adam gives away 50 blue stickers and 40 red stickers,
the ratio of blue stickers to red stickers becomes 1 : 3.
How many stickers are there at first?
|
Blue |
Red |
Before |
1 u + 50 |
3 u + 40 |
Change |
- 50 |
- 40 |
After |
1 u |
3 u |
The number of blue and red stickers is the same at first.
1 u + 50 = 3 u + 40
3 u - 1 u = 50 - 40
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has at first
= 1 u + 50 + 3 u + 40
= 1 u + 3 u + 50 + 40
= 4 u + 90
= 4 x 5 + 90
= 20 + 90
= 110
Answer(s): 110