The ratio of the number of blue stickers to red stickers is 9 : 4. After Bryan gives away 20 blue stickers and buys another 80 red stickers, there is equal number of blue stickers and red stickers. How many stickers does Bryan have now?
| |
Blue |
Red |
| Before |
9 u |
4 u |
| Change |
- 20 |
+ 80 |
| After |
9 u - 20 |
4 u + 80 |
The number of blue stickers and red stickers in the end is the same.
9 u - 20 = 4 u + 80
9 u - 4 u = 80 + 20
5 u = 100
1 u = 100 ÷ 5 = 20
Number of stickers that Bryan has now
= 9 u - 20 + 4 u + 80
= 9 u + 4 u - 20 + 80
= 13 u + 60
= 13 x 20 + 60
= 260 + 60
= 320
Answer(s): 320
