The number of red and blue stickers are equal.
If Adam gives away 70 red stickers and 50 blue stickers,
the ratio of red stickers to blue stickers becomes 1 : 3.
How many stickers are there at first?
|
Red |
Blue |
Before |
1 u + 70 |
3 u + 50 |
Change |
- 70 |
- 50 |
After |
1 u |
3 u |
The number of red and blue stickers is the same at first.
1 u + 70 = 3 u + 50
3 u - 1 u = 70 - 50
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has at first
= 1 u + 70 + 3 u + 50
= 1 u + 3 u + 70 + 50
= 4 u + 120
= 4 x 10 + 120
= 40 + 120
= 160
Answer(s): 160