The ratio of the number of red stickers to blue stickers is 9 : 5.
After Adam buys 70 red stickers and 90 blue stickers,
there is an equal number of red stickers and blue stickers.
How many stickers does Adam have now?
|
Red |
Blue |
Before |
9 u |
5 u |
Change |
+ 70 |
+ 90 |
After |
9 u + 70 |
5 u + 90 |
The number of red stickers and blue stickers are equal in the end.
9 u + 70 = 5 u + 90
9 u - 5 u = 90 - 70
4 u = 20
1 u = 20 ÷ 4 = 5
Number of stickers that Adam has now
= 9 u + 70 + 5 u + 90
= 9 u + 5 u + 70 + 90
= 14 u + 160
= 14 x 5 + 160
= 70 + 160
= 230
Answer(s): 230