The ratio of the number of blue stickers to green stickers is 7 : 3.
After Adam buys 20 blue stickers and 80 green stickers,
there is an equal number of blue stickers and green stickers.
How many stickers does Adam have now?
|
Blue |
Green |
Before |
7 u |
3 u |
Change |
+ 20 |
+ 80 |
After |
7 u + 20 |
3 u + 80 |
The number of blue stickers and green stickers are equal in the end.
7 u + 20 = 3 u + 80
7 u - 3 u = 80 - 20
4 u = 60
1 u = 60 ÷ 4 = 15
Number of stickers that Adam has now
= 7 u + 20 + 3 u + 80
= 7 u + 3 u + 20 + 80
= 10 u + 100
= 10 x 15 + 100
= 150 + 100
= 250
Answer(s): 250