The ratio of the number of green stickers to blue stickers is 7 : 2.
After Adam gives away 90 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 |
- 90 |
- 10 |
After |
7 u - 90 |
2 u - 10 |
The number of green stickers and blue stickers in the end is the same.
7 u - 90 = 2 u - 10
7 u - 2 u = 90 - 10
5 u = 80
1 u = 80 ÷ 5 = 16
Number of stickers that Adam has now
= 7 u - 90 + 2 u - 10
= 7 u + 2 u - 90 - 10
= 9 u - 100
= 9 x 16 - 100
= 144 - 100
= 44
Answer(s): 44