The ratio of the number of red stickers to blue stickers is 8 : 3.
After Adam buys 20 red stickers and 30 blue stickers,
there is an equal number of red stickers and blue stickers.
How many stickers does Adam have now?
|
Red |
Blue |
Before |
8 u |
3 u |
Change |
+ 20 |
+ 30 |
After |
8 u + 20 |
3 u + 30 |
The number of red stickers and blue stickers are equal in the end.
8 u + 20 = 3 u + 30
8 u - 3 u = 30 - 20
5 u = 10
1 u = 10 ÷ 5 = 2
Number of stickers that Adam has now
= 8 u + 20 + 3 u + 30
= 8 u + 3 u + 20 + 30
= 11 u + 50
= 11 x 2 + 50
= 22 + 50
= 72
Answer(s): 72