The ratio of the number of green stickers to red stickers is 7 : 5.
After Adam gives away 90 green stickers and 40 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 |
5 u |
Change |
- 90 |
- 40 |
After |
7 u - 90 |
5 u - 40 |
The number of green stickers and red stickers in the end is the same.
7 u - 90 = 5 u - 40
7 u - 5 u = 90 - 40
2 u = 50
1 u = 50 ÷ 2 = 25
Number of stickers that Adam has now
= 7 u - 90 + 5 u - 40
= 7 u + 5 u - 90 - 40
= 12 u - 130
= 12 x 25 - 130
= 300 - 130
= 170
Answer(s): 170