The ratio of the number of green stickers to blue stickers is 7 : 3.
After Adam buys 70 green stickers and 90 blue stickers,
there is an equal number of green stickers and blue stickers.
How many stickers does Adam have now?
|
Green |
Blue |
Before |
7 u |
3 u |
Change |
+ 70 |
+ 90 |
After |
7 u + 70 |
3 u + 90 |
The number of green stickers and blue stickers are equal in the end.
7 u + 70 = 3 u + 90
7 u - 3 u = 90 - 70
4 u = 20
1 u = 20 ÷ 4 = 5
Number of stickers that Adam has now
= 7 u + 70 + 3 u + 90
= 7 u + 3 u + 70 + 90
= 10 u + 160
= 10 x 5 + 160
= 50 + 160
= 210
Answer(s): 210