The ratio of the number of green stickers to red stickers is 3 : 1.
After Adam gives away 70 green stickers and 20 red stickers,
there is an equal number of green stickers and red stickers.
How many stickers does Adam have now?
|
Green |
Red |
Before |
3 u |
1 u |
Change |
- 70 |
- 20 |
After |
3 u - 70 |
1 u - 20 |
The number of green stickers and red stickers in the end is the same.
3 u - 70 = 1 u - 20
3 u - 1 u = 70 - 20
2 u = 50
1 u = 50 ÷ 2 = 25
Number of stickers that Adam has now
= 3 u - 70 + 1 u - 20
= 3 u + 1 u - 70 - 20
= 4 u - 90
= 4 x 25 - 90
= 100 - 90
= 10
Answer(s): 10