The ratio of the number of red stickers to blue stickers is 5 : 3.
After Adam buys 40 red stickers and 70 blue stickers,
there is an equal number of red stickers and blue stickers.
How many stickers does Adam have now?
|
Red |
Blue |
Before |
5 u |
3 u |
Change |
+ 40 |
+ 70 |
After |
5 u + 40 |
3 u + 70 |
The number of red stickers and blue stickers are equal in the end.
5 u + 40 = 3 u + 70
5 u - 3 u = 70 - 40
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Adam has now
= 5 u + 40 + 3 u + 70
= 5 u + 3 u + 40 + 70
= 8 u + 110
= 8 x 15 + 110
= 120 + 110
= 230
Answer(s): 230