The ratio of the number of green stickers to blue stickers is 8 : 3. After Eric gives away 50 green stickers and buys another 70 blue stickers, there is equal number of green stickers and blue stickers. How many stickers does Eric have now?
| |
Green |
Blue |
| Before |
8 u |
3 u |
| Change |
- 50 |
+ 70 |
| After |
8 u - 50 |
3 u + 70 |
The number of green stickers and blue stickers in the end is the same.
8 u - 50 = 3 u + 70
8 u - 3 u = 70 + 50
5 u = 120
1 u = 120 ÷ 5 = 24
Number of stickers that Eric has now
= 8 u - 50 + 3 u + 70
= 8 u + 3 u - 50 + 70
= 11 u + 20
= 11 x 24 + 20
= 264 + 20
= 284
Answer(s): 284
