The number of red and blue stickers are equal.
If Adam gives away 80 red stickers and 10 blue stickers,
the ratio of red stickers to blue stickers becomes 2 : 9.
How many stickers are there at first?
|
Red |
Blue |
Before |
2 u + 80 |
9 u + 10 |
Change |
- 80 |
- 10 |
After |
2 u |
9 u |
The number of red and blue stickers is the same at first.
2 u + 80 = 9 u + 10
9 u - 2 u = 80 - 10
7 u = 70
1 u = 70 ÷ 7 = 10
Number of stickers that Adam has at first
= 2 u + 80 + 9 u + 10
= 2 u + 9 u + 80 + 10
= 11 u + 90
= 11 x 10 + 90
= 110 + 90
= 200
Answer(s): 200