The ratio of the number of blue stickers to green stickers is 7 : 5.
After Adam gives away 70 blue stickers and 10 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
7 u |
5 u |
Change |
- 70 |
- 10 |
After |
7 u - 70 |
5 u - 10 |
The number of blue stickers and green stickers in the end is the same.
7 u - 70 = 5 u - 10
7 u - 5 u = 70 - 10
2 u = 60
1 u = 60 ÷ 2 = 30
Number of stickers that Adam has now
= 7 u - 70 + 5 u - 10
= 7 u + 5 u - 70 - 10
= 12 u - 80
= 12 x 30 - 80
= 360 - 80
= 280
Answer(s): 280