The ratio of the number of blue stickers to green stickers is 3 : 1.
After Adam gives away 70 blue stickers and 10 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 |
- 70 |
- 10 |
After |
3 u - 70 |
1 u - 10 |
The number of blue stickers and green stickers in the end is the same.
3 u - 70 = 1 u - 10
3 u - 1 u = 70 - 10
2 u = 60
1 u = 60 ÷ 2 = 30
Number of stickers that Adam has now
= 3 u - 70 + 1 u - 10
= 3 u + 1 u - 70 - 10
= 4 u - 80
= 4 x 30 - 80
= 120 - 80
= 40
Answer(s): 40