The ratio of the number of blue stickers to green stickers is 7 : 2.
After Adam gives away 90 blue stickers and 20 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 |
2 u |
Change |
- 90 |
- 20 |
After |
7 u - 90 |
2 u - 20 |
The number of blue stickers and green stickers in the end is the same.
7 u - 90 = 2 u - 20
7 u - 2 u = 90 - 20
5 u = 70
1 u = 70 ÷ 5 = 14
Number of stickers that Adam has now
= 7 u - 90 + 2 u - 20
= 7 u + 2 u - 90 - 20
= 9 u - 110
= 9 x 14 - 110
= 126 - 110
= 16
Answer(s): 16