The ratio of the number of red stickers to blue stickers is 5 : 2.
After Adam gives away 70 red stickers and 10 blue stickers,
there is an equal number of red stickers and blue stickers.
How many stickers does Adam have now?
|
Red |
Blue |
Before |
5 u |
2 u |
Change |
- 70 |
- 10 |
After |
5 u - 70 |
2 u - 10 |
The number of red stickers and blue stickers in the end is the same.
5 u - 70 = 2 u - 10
5 u - 2 u = 70 - 10
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has now
= 5 u - 70 + 2 u - 10
= 5 u + 2 u - 70 - 10
= 7 u - 80
= 7 x 20 - 80
= 140 - 80
= 60
Answer(s): 60