The number of blue and green stickers are equal.
If Adam gives away 30 blue stickers and 10 green stickers,
the ratio of blue stickers to green stickers becomes 2 : 7.
How many stickers are there at first?
|
Blue |
Green |
Before |
2 u + 30 |
7 u + 10 |
Change |
- 30 |
- 10 |
After |
2 u |
7 u |
The number of blue and green stickers is the same at first.
2 u + 30 = 7 u + 10
7 u - 2 u = 30 - 10
5 u = 20
1 u = 20 ÷ 5 = 4
Number of stickers that Adam has at first
= 2 u + 30 + 7 u + 10
= 2 u + 7 u + 30 + 10
= 9 u + 40
= 9 x 4 + 40
= 36 + 40
= 76
Answer(s): 76