The number of green and red stickers are equal.
If Adam gives away 90 green stickers and 30 red stickers,
the ratio of green stickers to red stickers becomes 2 : 7.
How many stickers are there at first?
|
Green |
Red |
Before |
2 u + 90 |
7 u + 30 |
Change |
- 90 |
- 30 |
After |
2 u |
7 u |
The number of green and red stickers is the same at first.
2 u + 90 = 7 u + 30
7 u - 2 u = 90 - 30
5 u = 60
1 u = 60 ÷ 5 = 12
Number of stickers that Adam has at first
= 2 u + 90 + 7 u + 30
= 2 u + 7 u + 90 + 30
= 9 u + 120
= 9 x 12 + 120
= 108 + 120
= 228
Answer(s): 228