The ratio of the number of red stickers to blue stickers is 7 : 3.
After Adam buys 30 red stickers and 70 blue stickers,
there is an equal number of red stickers and blue stickers.
How many stickers does Adam have now?
|
Red |
Blue |
Before |
7 u |
3 u |
Change |
+ 30 |
+ 70 |
After |
7 u + 30 |
3 u + 70 |
The number of red stickers and blue stickers are equal in the end.
7 u + 30 = 3 u + 70
7 u - 3 u = 70 - 30
4 u = 40
1 u = 40 ÷ 4 = 10
Number of stickers that Adam has now
= 7 u + 30 + 3 u + 70
= 7 u + 3 u + 30 + 70
= 10 u + 100
= 10 x 10 + 100
= 100 + 100
= 200
Answer(s): 200