The ratio of the number of red stickers to blue stickers is 4 : 1. After Ryan gives away 60 red stickers and buys another 90 blue stickers, there is equal number of red stickers and blue stickers. How many stickers does Ryan have now?
| |
Red |
Blue |
| Before |
4 u |
1 u |
| Change |
- 60 |
+ 90 |
| After |
4 u - 60 |
1 u + 90 |
The number of red stickers and blue stickers in the end is the same.
4 u - 60 = 1 u + 90
4 u - 1 u = 90 + 60
3 u = 150
1 u = 150 ÷ 3 = 50
Number of stickers that Ryan has now
= 4 u - 60 + 1 u + 90
= 4 u + 1 u - 60 + 90
= 5 u + 30
= 5 x 50 + 30
= 250 + 30
= 280
Answer(s): 280
