The number of blue and red stickers are equal.
If Adam gives away 90 blue stickers and 30 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 + 90 |
9 u + 30 |
Change |
- 90 |
- 30 |
After |
5 u |
9 u |
The number of blue and red stickers is the same at first.
5 u + 90 = 9 u + 30
9 u - 5 u = 90 - 30
4 u = 60
1 u = 60 ÷ 4 = 15
Number of stickers that Adam has at first
= 5 u + 90 + 9 u + 30
= 5 u + 9 u + 90 + 30
= 14 u + 120
= 14 x 15 + 120
= 210 + 120
= 330
Answer(s): 330