The ratio of the number of green stickers to blue stickers is 5 : 2.
After Adam gives away 40 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 |
5 u |
2 u |
Change |
- 40 |
- 10 |
After |
5 u - 40 |
2 u - 10 |
The number of green stickers and blue stickers in the end is the same.
5 u - 40 = 2 u - 10
5 u - 2 u = 40 - 10
3 u = 30
1 u = 30 ÷ 3 = 10
Number of stickers that Adam has now
= 5 u - 40 + 2 u - 10
= 5 u + 2 u - 40 - 10
= 7 u - 50
= 7 x 10 - 50
= 70 - 50
= 20
Answer(s): 20