The ratio of the number of blue stickers to red stickers is 3 : 1.
After Adam buys 10 blue stickers and 70 red stickers,
there is an equal number of blue stickers and red stickers.
How many stickers does Adam have now?
|
Blue |
Red |
Before |
3 u |
1 u |
Change |
+ 10 |
+ 70 |
After |
3 u + 10 |
1 u + 70 |
The number of blue stickers and red stickers are equal in the end.
3 u + 10 = 1 u + 70
3 u - 1 u = 70 - 10
2 u = 60
1 u = 60 ÷ 2 = 30
Number of stickers that Adam has now
= 3 u + 10 + 1 u + 70
= 3 u + 1 u + 10 + 70
= 4 u + 80
= 4 x 30 + 80
= 120 + 80
= 200
Answer(s): 200