The ratio of the number of green stickers to red stickers is 3 : 1.
After Adam buys 50 green stickers and 90 red stickers,
there is an equal number of green stickers and red stickers.
How many stickers does Adam have now?
|
Green |
Red |
Before |
3 u |
1 u |
Change |
+ 50 |
+ 90 |
After |
3 u + 50 |
1 u + 90 |
The number of green stickers and red stickers are equal in the end.
3 u + 50 = 1 u + 90
3 u - 1 u = 90 - 50
2 u = 40
1 u = 40 ÷ 2 = 20
Number of stickers that Adam has now
= 3 u + 50 + 1 u + 90
= 3 u + 1 u + 50 + 90
= 4 u + 140
= 4 x 20 + 140
= 80 + 140
= 220
Answer(s): 220