The ratio of the number of blue stickers to green stickers is 9 : 7.
After Adam gives away 70 blue stickers and 50 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
9 u |
7 u |
Change |
- 70 |
- 50 |
After |
9 u - 70 |
7 u - 50 |
The number of blue stickers and green stickers in the end is the same.
9 u - 70 = 7 u - 50
9 u - 7 u = 70 - 50
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 9 u - 70 + 7 u - 50
= 9 u + 7 u - 70 - 50
= 16 u - 120
= 16 x 10 - 120
= 160 - 120
= 40
Answer(s): 40