The ratio of the number of blue stickers to green stickers is 3 : 1.
After Adam gives away 90 blue stickers and 20 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
3 u |
1 u |
Change |
- 90 |
- 20 |
After |
3 u - 90 |
1 u - 20 |
The number of blue stickers and green stickers in the end is the same.
3 u - 90 = 1 u - 20
3 u - 1 u = 90 - 20
2 u = 70
1 u = 70 ÷ 2 = 35
Number of stickers that Adam has now
= 3 u - 90 + 1 u - 20
= 3 u + 1 u - 90 - 20
= 4 u - 110
= 4 x 35 - 110
= 140 - 110
= 30
Answer(s): 30