The ratio of the number of green stickers to blue stickers is 9 : 7.
After Adam gives away 50 green stickers and 20 blue stickers,
there is an equal number of green stickers and blue stickers.
How many stickers does Adam have now?
|
Green |
Blue |
Before |
9 u |
7 u |
Change |
- 50 |
- 20 |
After |
9 u - 50 |
7 u - 20 |
The number of green stickers and blue stickers in the end is the same.
9 u - 50 = 7 u - 20
9 u - 7 u = 50 - 20
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Adam has now
= 9 u - 50 + 7 u - 20
= 9 u + 7 u - 50 - 20
= 16 u - 70
= 16 x 15 - 70
= 240 - 70
= 170
Answer(s): 170