The ratio of the number of green stickers to blue stickers is 3 : 1.
After Adam buys 10 green stickers and 20 blue stickers,
there is an equal number of green stickers and blue stickers.
How many stickers does Adam have now?
|
Green |
Blue |
Before |
3 u |
1 u |
Change |
+ 10 |
+ 20 |
After |
3 u + 10 |
1 u + 20 |
The number of green stickers and blue stickers are equal in the end.
3 u + 10 = 1 u + 20
3 u - 1 u = 20 - 10
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has now
= 3 u + 10 + 1 u + 20
= 3 u + 1 u + 10 + 20
= 4 u + 30
= 4 x 5 + 30
= 20 + 30
= 50
Answer(s): 50