The ratio of the number of green stickers to blue stickers is 9 : 5.
After Adam gives away 30 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 |
9 u |
5 u |
Change |
- 30 |
- 10 |
After |
9 u - 30 |
5 u - 10 |
The number of green stickers and blue stickers in the end is the same.
9 u - 30 = 5 u - 10
9 u - 5 u = 30 - 10
4 u = 20
1 u = 20 ÷ 4 = 5
Number of stickers that Adam has now
= 9 u - 30 + 5 u - 10
= 9 u + 5 u - 30 - 10
= 14 u - 40
= 14 x 5 - 40
= 70 - 40
= 30
Answer(s): 30