The ratio of the number of green stickers to red stickers is 7 : 5.
After Adam buys 40 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 |
7 u |
5 u |
Change |
+ 40 |
+ 90 |
After |
7 u + 40 |
5 u + 90 |
The number of green stickers and red stickers are equal in the end.
7 u + 40 = 5 u + 90
7 u - 5 u = 90 - 40
2 u = 50
1 u = 50 ÷ 2 = 25
Number of stickers that Adam has now
= 7 u + 40 + 5 u + 90
= 7 u + 5 u + 40 + 90
= 12 u + 130
= 12 x 25 + 130
= 300 + 130
= 430
Answer(s): 430