The ratio of the number of blue stickers to red stickers is 9 : 4.
After Adam gives away 70 blue stickers and 20 red stickers,
there is an equal number of blue stickers and red stickers.
How many stickers does Adam have now?
|
Blue |
Red |
Before |
9 u |
4 u |
Change |
- 70 |
- 20 |
After |
9 u - 70 |
4 u - 20 |
The number of blue stickers and red stickers in the end is the same.
9 u - 70 = 4 u - 20
9 u - 4 u = 70 - 20
5 u = 50
1 u = 50 ÷ 5 = 10
Number of stickers that Adam has now
= 9 u - 70 + 4 u - 20
= 9 u + 4 u - 70 - 20
= 13 u - 90
= 13 x 10 - 90
= 130 - 90
= 40
Answer(s): 40