The ratio of the number of green stickers to red stickers is 9 : 7.
After Adam gives away 70 green stickers and 20 red stickers,
there is an equal number of green stickers and red stickers.
How many stickers does Adam have now?
|
Green |
Red |
Before |
9 u |
7 u |
Change |
- 70 |
- 20 |
After |
9 u - 70 |
7 u - 20 |
The number of green stickers and red stickers in the end is the same.
9 u - 70 = 7 u - 20
9 u - 7 u = 70 - 20
2 u = 50
1 u = 50 ÷ 2 = 25
Number of stickers that Adam has now
= 9 u - 70 + 7 u - 20
= 9 u + 7 u - 70 - 20
= 16 u - 90
= 16 x 25 - 90
= 400 - 90
= 310
Answer(s): 310