The ratio of the number of blue stickers to red stickers is 5 : 2.
After Adam gives away 80 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 |
5 u |
2 u |
Change |
- 80 |
- 20 |
After |
5 u - 80 |
2 u - 20 |
The number of blue stickers and red stickers in the end is the same.
5 u - 80 = 2 u - 20
5 u - 2 u = 80 - 20
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has now
= 5 u - 80 + 2 u - 20
= 5 u + 2 u - 80 - 20
= 7 u - 100
= 7 x 20 - 100
= 140 - 100
= 40
Answer(s): 40