The number of blue and red stickers are equal.
If Adam gives away 60 blue stickers and 40 red stickers,
the ratio of blue stickers to red stickers becomes 4 : 9.
How many stickers are there at first?
|
Blue |
Red |
Before |
4 u + 60 |
9 u + 40 |
Change |
- 60 |
- 40 |
After |
4 u |
9 u |
The number of blue and red stickers is the same at first.
4 u + 60 = 9 u + 40
9 u - 4 u = 60 - 40
5 u = 20
1 u = 20 ÷ 5 = 4
Number of stickers that Adam has at first
= 4 u + 60 + 9 u + 40
= 4 u + 9 u + 60 + 40
= 13 u + 100
= 13 x 4 + 100
= 52 + 100
= 152
Answer(s): 152