The ratio of the number of blue stickers to red stickers is 7 : 5.
After Adam gives away 60 blue stickers and 20 red stickers,
there is an equal number of blue stickers and red stickers.
How many stickers does Adam have now?
|
Blue |
Red |
Before |
7 u |
5 u |
Change |
- 60 |
- 20 |
After |
7 u - 60 |
5 u - 20 |
The number of blue stickers and red stickers in the end is the same.
7 u - 60 = 5 u - 20
7 u - 5 u = 60 - 20
2 u = 40
1 u = 40 ÷ 2 = 20
Number of stickers that Adam has now
= 7 u - 60 + 5 u - 20
= 7 u + 5 u - 60 - 20
= 12 u - 80
= 12 x 20 - 80
= 240 - 80
= 160
Answer(s): 160