The ratio of the number of red stickers to green stickers is 3 : 1.
After Adam buys 80 red stickers and 90 green stickers,
there is an equal number of red stickers and green stickers.
How many stickers does Adam have now?
|
Red |
Green |
Before |
3 u |
1 u |
Change |
+ 80 |
+ 90 |
After |
3 u + 80 |
1 u + 90 |
The number of red stickers and green stickers are equal in the end.
3 u + 80 = 1 u + 90
3 u - 1 u = 90 - 80
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has now
= 3 u + 80 + 1 u + 90
= 3 u + 1 u + 80 + 90
= 4 u + 170
= 4 x 5 + 170
= 20 + 170
= 190
Answer(s): 190