The ratio of the number of green stickers to blue stickers is 7 : 2.
After Adam gives away 80 green stickers and 10 blue stickers,
there is an equal number of green stickers and blue stickers.
How many stickers does Adam have now?
|
Green |
Blue |
Before |
7 u |
2 u |
Change |
- 80 |
- 10 |
After |
7 u - 80 |
2 u - 10 |
The number of green stickers and blue stickers in the end is the same.
7 u - 80 = 2 u - 10
7 u - 2 u = 80 - 10
5 u = 70
1 u = 70 ÷ 5 = 14
Number of stickers that Adam has now
= 7 u - 80 + 2 u - 10
= 7 u + 2 u - 80 - 10
= 9 u - 90
= 9 x 14 - 90
= 126 - 90
= 36
Answer(s): 36