The ratio of the number of green stickers to blue stickers is 9 : 7.
After Adam gives away 90 green stickers and 40 blue stickers,
there is an equal number of green stickers and blue stickers.
How many stickers does Adam have now?
|
Green |
Blue |
Before |
9 u |
7 u |
Change |
- 90 |
- 40 |
After |
9 u - 90 |
7 u - 40 |
The number of green stickers and blue stickers in the end is the same.
9 u - 90 = 7 u - 40
9 u - 7 u = 90 - 40
2 u = 50
1 u = 50 ÷ 2 = 25
Number of stickers that Adam has now
= 9 u - 90 + 7 u - 40
= 9 u + 7 u - 90 - 40
= 16 u - 130
= 16 x 25 - 130
= 400 - 130
= 270
Answer(s): 270