The ratio of the number of blue stickers to green stickers is 9 : 4.
After Adam buys 30 blue stickers and 90 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
9 u |
4 u |
Change |
+ 30 |
+ 90 |
After |
9 u + 30 |
4 u + 90 |
The number of blue stickers and green stickers are equal in the end.
9 u + 30 = 4 u + 90
9 u - 4 u = 90 - 30
5 u = 60
1 u = 60 ÷ 5 = 12
Number of stickers that Adam has now
= 9 u + 30 + 4 u + 90
= 9 u + 4 u + 30 + 90
= 13 u + 120
= 13 x 12 + 120
= 156 + 120
= 276
Answer(s): 276