The ratio of the number of blue stickers to green stickers is 3 : 1.
After Adam buys 10 blue stickers and 30 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
3 u |
1 u |
Change |
+ 10 |
+ 30 |
After |
3 u + 10 |
1 u + 30 |
The number of blue stickers and green stickers are equal in the end.
3 u + 10 = 1 u + 30
3 u - 1 u = 30 - 10
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has now
= 3 u + 10 + 1 u + 30
= 3 u + 1 u + 10 + 30
= 4 u + 40
= 4 x 10 + 40
= 40 + 40
= 80
Answer(s): 80