The ratio of the number of red stickers to green stickers is 9 : 4.
After Adam buys 40 red stickers and 70 green stickers,
there is an equal number of red stickers and green stickers.
How many stickers does Adam have now?
|
Red |
Green |
Before |
9 u |
4 u |
Change |
+ 40 |
+ 70 |
After |
9 u + 40 |
4 u + 70 |
The number of red stickers and green stickers are equal in the end.
9 u + 40 = 4 u + 70
9 u - 4 u = 70 - 40
5 u = 30
1 u = 30 ÷ 5 = 6
Number of stickers that Adam has now
= 9 u + 40 + 4 u + 70
= 9 u + 4 u + 40 + 70
= 13 u + 110
= 13 x 6 + 110
= 78 + 110
= 188
Answer(s): 188