The ratio of the number of red stickers to green stickers is 7 : 5.
After Adam buys 20 red stickers and 50 green stickers,
there is an equal number of red stickers and green stickers.
How many stickers does Adam have now?
|
Red |
Green |
Before |
7 u |
5 u |
Change |
+ 20 |
+ 50 |
After |
7 u + 20 |
5 u + 50 |
The number of red stickers and green stickers are equal in the end.
7 u + 20 = 5 u + 50
7 u - 5 u = 50 - 20
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Adam has now
= 7 u + 20 + 5 u + 50
= 7 u + 5 u + 20 + 50
= 12 u + 70
= 12 x 15 + 70
= 180 + 70
= 250
Answer(s): 250