The ratio of the number of green stickers to red stickers is 7 : 2.
After Adam buys 30 green stickers and 40 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 |
2 u |
Change |
+ 30 |
+ 40 |
After |
7 u + 30 |
2 u + 40 |
The number of green stickers and red stickers are equal in the end.
7 u + 30 = 2 u + 40
7 u - 2 u = 40 - 30
5 u = 10
1 u = 10 ÷ 5 = 2
Number of stickers that Adam has now
= 7 u + 30 + 2 u + 40
= 7 u + 2 u + 30 + 40
= 9 u + 70
= 9 x 2 + 70
= 18 + 70
= 88
Answer(s): 88