The ratio of the number of blue stickers to green stickers is 5 : 3.
After Adam gives away 90 blue stickers and 50 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 |
3 u |
Change |
- 90 |
- 50 |
After |
5 u - 90 |
3 u - 50 |
The number of blue stickers and green stickers in the end is the same.
5 u - 90 = 3 u - 50
5 u - 3 u = 90 - 50
2 u = 40
1 u = 40 ÷ 2 = 20
Number of stickers that Adam has now
= 5 u - 90 + 3 u - 50
= 5 u + 3 u - 90 - 50
= 8 u - 140
= 8 x 20 - 140
= 160 - 140
= 20
Answer(s): 20