The ratio of the number of green stickers to blue stickers is 7 : 4.
After Adam gives away 60 green stickers and 30 blue stickers,
there is an equal number of green stickers and blue stickers.
How many stickers does Adam have now?
|
Green |
Blue |
Before |
7 u |
4 u |
Change |
- 60 |
- 30 |
After |
7 u - 60 |
4 u - 30 |
The number of green stickers and blue stickers in the end is the same.
7 u - 60 = 4 u - 30
7 u - 4 u = 60 - 30
3 u = 30
1 u = 30 ÷ 3 = 10
Number of stickers that Adam has now
= 7 u - 60 + 4 u - 30
= 7 u + 4 u - 60 - 30
= 11 u - 90
= 11 x 10 - 90
= 110 - 90
= 20
Answer(s): 20