The number of green and blue stickers are equal.
If Adam gives away 90 green stickers and 60 blue stickers,
the ratio of green stickers to blue stickers becomes 5 : 7.
How many stickers are there at first?
|
Green |
Blue |
Before |
5 u + 90 |
7 u + 60 |
Change |
- 90 |
- 60 |
After |
5 u |
7 u |
The number of green and blue stickers is the same at first.
5 u + 90 = 7 u + 60
7 u - 5 u = 90 - 60
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Adam has at first
= 5 u + 90 + 7 u + 60
= 5 u + 7 u + 90 + 60
= 12 u + 150
= 12 x 15 + 150
= 180 + 150
= 330
Answer(s): 330