The ratio of the number of blue stickers to green stickers is 7 : 2.
After Adam buys 30 blue stickers and 70 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 |
2 u |
Change |
+ 30 |
+ 70 |
After |
7 u + 30 |
2 u + 70 |
The number of blue stickers and green stickers are equal in the end.
7 u + 30 = 2 u + 70
7 u - 2 u = 70 - 30
5 u = 40
1 u = 40 ÷ 5 = 8
Number of stickers that Adam has now
= 7 u + 30 + 2 u + 70
= 7 u + 2 u + 30 + 70
= 9 u + 100
= 9 x 8 + 100
= 72 + 100
= 172
Answer(s): 172