The number of blue and red stickers are equal.
If Adam gives away 30 blue stickers and 10 red stickers,
the ratio of blue stickers to red stickers becomes 5 : 9.
How many stickers are there at first?
|
Blue |
Red |
Before |
5 u + 30 |
9 u + 10 |
Change |
- 30 |
- 10 |
After |
5 u |
9 u |
The number of blue and red stickers is the same at first.
5 u + 30 = 9 u + 10
9 u - 5 u = 30 - 10
4 u = 20
1 u = 20 ÷ 4 = 5
Number of stickers that Adam has at first
= 5 u + 30 + 9 u + 10
= 5 u + 9 u + 30 + 10
= 14 u + 40
= 14 x 5 + 40
= 70 + 40
= 110
Answer(s): 110