The ratio of the number of blue stickers to green stickers is 9 : 7.
After Adam buys 10 blue stickers and 40 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 |
7 u |
Change |
+ 10 |
+ 40 |
After |
9 u + 10 |
7 u + 40 |
The number of blue stickers and green stickers are equal in the end.
9 u + 10 = 7 u + 40
9 u - 7 u = 40 - 10
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Adam has now
= 9 u + 10 + 7 u + 40
= 9 u + 7 u + 10 + 40
= 16 u + 50
= 16 x 15 + 50
= 240 + 50
= 290
Answer(s): 290