The ratio of the number of blue stickers to green stickers is 5 : 2.
After Adam gives away 90 blue stickers and 30 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
5 u |
2 u |
Change |
- 90 |
- 30 |
After |
5 u - 90 |
2 u - 30 |
The number of blue stickers and green stickers in the end is the same.
5 u - 90 = 2 u - 30
5 u - 2 u = 90 - 30
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has now
= 5 u - 90 + 2 u - 30
= 5 u + 2 u - 90 - 30
= 7 u - 120
= 7 x 20 - 120
= 140 - 120
= 20
Answer(s): 20