The ratio of the number of blue stickers to green stickers is 7 : 5.
After Adam gives away 60 blue stickers and 30 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
7 u |
5 u |
Change |
- 60 |
- 30 |
After |
7 u - 60 |
5 u - 30 |
The number of blue stickers and green stickers in the end is the same.
7 u - 60 = 5 u - 30
7 u - 5 u = 60 - 30
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Adam has now
= 7 u - 60 + 5 u - 30
= 7 u + 5 u - 60 - 30
= 12 u - 90
= 12 x 15 - 90
= 180 - 90
= 90
Answer(s): 90