The ratio of the number of blue stickers to green stickers is 7 : 5.
After Adam gives away 40 blue stickers and 10 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
7 u |
5 u |
Change |
- 40 |
- 10 |
After |
7 u - 40 |
5 u - 10 |
The number of blue stickers and green stickers in the end is the same.
7 u - 40 = 5 u - 10
7 u - 5 u = 40 - 10
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Adam has now
= 7 u - 40 + 5 u - 10
= 7 u + 5 u - 40 - 10
= 12 u - 50
= 12 x 15 - 50
= 180 - 50
= 130
Answer(s): 130