The ratio of the number of red stickers to blue stickers is 3 : 1.
After Adam buys 10 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 |
3 u |
1 u |
Change |
+ 10 |
+ 90 |
After |
3 u + 10 |
1 u + 90 |
The number of red stickers and blue stickers are equal in the end.
3 u + 10 = 1 u + 90
3 u - 1 u = 90 - 10
2 u = 80
1 u = 80 ÷ 2 = 40
Number of stickers that Adam has now
= 3 u + 10 + 1 u + 90
= 3 u + 1 u + 10 + 90
= 4 u + 100
= 4 x 40 + 100
= 160 + 100
= 260
Answer(s): 260