The number of green and blue stickers are equal.
If Adam gives away 30 green stickers and 20 blue stickers,
the ratio of green stickers to blue stickers becomes 2 : 7.
How many stickers are there at first?
|
Green |
Blue |
Before |
2 u + 30 |
7 u + 20 |
Change |
- 30 |
- 20 |
After |
2 u |
7 u |
The number of green and blue stickers is the same at first.
2 u + 30 = 7 u + 20
7 u - 2 u = 30 - 20
5 u = 10
1 u = 10 ÷ 5 = 2
Number of stickers that Adam has at first
= 2 u + 30 + 7 u + 20
= 2 u + 7 u + 30 + 20
= 9 u + 50
= 9 x 2 + 50
= 18 + 50
= 68
Answer(s): 68