The ratio of the number of green stickers to red stickers is 7 : 2.
After Adam gives away 40 green stickers and 10 red stickers,
there is an equal number of green stickers and red stickers.
How many stickers does Adam have now?
|
Green |
Red |
Before |
7 u |
2 u |
Change |
- 40 |
- 10 |
After |
7 u - 40 |
2 u - 10 |
The number of green stickers and red stickers in the end is the same.
7 u - 40 = 2 u - 10
7 u - 2 u = 40 - 10
5 u = 30
1 u = 30 ÷ 5 = 6
Number of stickers that Adam has now
= 7 u - 40 + 2 u - 10
= 7 u + 2 u - 40 - 10
= 9 u - 50
= 9 x 6 - 50
= 54 - 50
= 4
Answer(s): 4