The ratio of the number of green stickers to blue stickers is 3 : 1.
After Adam gives away 90 green stickers and 10 blue stickers,
there is an equal number of green stickers and blue stickers.
How many stickers does Adam have now?
|
Green |
Blue |
Before |
3 u |
1 u |
Change |
- 90 |
- 10 |
After |
3 u - 90 |
1 u - 10 |
The number of green stickers and blue stickers in the end is the same.
3 u - 90 = 1 u - 10
3 u - 1 u = 90 - 10
2 u = 80
1 u = 80 ÷ 2 = 40
Number of stickers that Adam has now
= 3 u - 90 + 1 u - 10
= 3 u + 1 u - 90 - 10
= 4 u - 100
= 4 x 40 - 100
= 160 - 100
= 60
Answer(s): 60