The ratio of the number of red stickers to blue stickers is 3 : 1.
After Adam buys 10 red stickers and 50 blue stickers,
there is an equal number of red stickers and blue stickers.
How many stickers does Adam have now?
|
Red |
Blue |
Before |
3 u |
1 u |
Change |
+ 10 |
+ 50 |
After |
3 u + 10 |
1 u + 50 |
The number of red stickers and blue stickers are equal in the end.
3 u + 10 = 1 u + 50
3 u - 1 u = 50 - 10
2 u = 40
1 u = 40 ÷ 2 = 20
Number of stickers that Adam has now
= 3 u + 10 + 1 u + 50
= 3 u + 1 u + 10 + 50
= 4 u + 60
= 4 x 20 + 60
= 80 + 60
= 140
Answer(s): 140