The ratio of the number of red stickers to blue stickers is 8 : 3.
After Adam buys 70 red stickers and 80 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 |
+ 70 |
+ 80 |
After |
8 u + 70 |
3 u + 80 |
The number of red stickers and blue stickers are equal in the end.
8 u + 70 = 3 u + 80
8 u - 3 u = 80 - 70
5 u = 10
1 u = 10 ÷ 5 = 2
Number of stickers that Adam has now
= 8 u + 70 + 3 u + 80
= 8 u + 3 u + 70 + 80
= 11 u + 150
= 11 x 2 + 150
= 22 + 150
= 172
Answer(s): 172