The ratio of the number of green stickers to red stickers is 9 : 4.
After Adam gives away 90 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 |
4 u |
Change |
- 90 |
- 20 |
After |
9 u - 90 |
4 u - 20 |
The number of green stickers and red stickers in the end is the same.
9 u - 90 = 4 u - 20
9 u - 4 u = 90 - 20
5 u = 70
1 u = 70 ÷ 5 = 14
Number of stickers that Adam has now
= 9 u - 90 + 4 u - 20
= 9 u + 4 u - 90 - 20
= 13 u - 110
= 13 x 14 - 110
= 182 - 110
= 72
Answer(s): 72