The ratio of the number of green stickers to red stickers is 9 : 4.
After Adam buys 80 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 |
9 u |
4 u |
Change |
+ 80 |
+ 90 |
After |
9 u + 80 |
4 u + 90 |
The number of green stickers and red stickers are equal in the end.
9 u + 80 = 4 u + 90
9 u - 4 u = 90 - 80
5 u = 10
1 u = 10 ÷ 5 = 2
Number of stickers that Adam has now
= 9 u + 80 + 4 u + 90
= 9 u + 4 u + 80 + 90
= 13 u + 170
= 13 x 2 + 170
= 26 + 170
= 196
Answer(s): 196