The number of red and blue stickers are equal.
If Adam gives away 30 red stickers and 10 blue stickers,
the ratio of red stickers to blue stickers becomes 3 : 8.
How many stickers are there at first?
|
Red |
Blue |
Before |
3 u + 30 |
8 u + 10 |
Change |
- 30 |
- 10 |
After |
3 u |
8 u |
The number of red and blue stickers is the same at first.
3 u + 30 = 8 u + 10
8 u - 3 u = 30 - 10
5 u = 20
1 u = 20 ÷ 5 = 4
Number of stickers that Adam has at first
= 3 u + 30 + 8 u + 10
= 3 u + 8 u + 30 + 10
= 11 u + 40
= 11 x 4 + 40
= 44 + 40
= 84
Answer(s): 84