The ratio of the number of green stickers to blue stickers is 9 : 7.
After Adam buys 30 green stickers and 40 blue stickers,
there is an equal number of green stickers and blue stickers.
How many stickers does Adam have now?
|
Green |
Blue |
Before |
9 u |
7 u |
Change |
+ 30 |
+ 40 |
After |
9 u + 30 |
7 u + 40 |
The number of green stickers and blue stickers are equal in the end.
9 u + 30 = 7 u + 40
9 u - 7 u = 40 - 30
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has now
= 9 u + 30 + 7 u + 40
= 9 u + 7 u + 30 + 40
= 16 u + 70
= 16 x 5 + 70
= 80 + 70
= 150
Answer(s): 150