The number of green and blue stickers are equal.
If Adam gives away 50 green stickers and 20 blue stickers,
the ratio of green stickers to blue stickers becomes 2 : 5.
How many stickers are there at first?
|
Green |
Blue |
Before |
2 u + 50 |
5 u + 20 |
Change |
- 50 |
- 20 |
After |
2 u |
5 u |
The number of green and blue stickers is the same at first.
2 u + 50 = 5 u + 20
5 u - 2 u = 50 - 20
3 u = 30
1 u = 30 ÷ 3 = 10
Number of stickers that Adam has at first
= 2 u + 50 + 5 u + 20
= 2 u + 5 u + 50 + 20
= 7 u + 70
= 7 x 10 + 70
= 70 + 70
= 140
Answer(s): 140