The ratio of the number of red stickers to blue stickers is 7 : 2.
After Adam buys 10 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 |
2 u |
Change |
+ 10 |
+ 70 |
After |
7 u + 10 |
2 u + 70 |
The number of red stickers and blue stickers are equal in the end.
7 u + 10 = 2 u + 70
7 u - 2 u = 70 - 10
5 u = 60
1 u = 60 ÷ 5 = 12
Number of stickers that Adam has now
= 7 u + 10 + 2 u + 70
= 7 u + 2 u + 10 + 70
= 9 u + 80
= 9 x 12 + 80
= 108 + 80
= 188
Answer(s): 188