The ratio of the number of blue stickers to red stickers is 7 : 2.
After Adam buys 30 blue stickers and 90 red stickers,
there is an equal number of blue stickers and red stickers.
How many stickers does Adam have now?
|
Blue |
Red |
Before |
7 u |
2 u |
Change |
+ 30 |
+ 90 |
After |
7 u + 30 |
2 u + 90 |
The number of blue stickers and red stickers are equal in the end.
7 u + 30 = 2 u + 90
7 u - 2 u = 90 - 30
5 u = 60
1 u = 60 ÷ 5 = 12
Number of stickers that Adam has now
= 7 u + 30 + 2 u + 90
= 7 u + 2 u + 30 + 90
= 9 u + 120
= 9 x 12 + 120
= 108 + 120
= 228
Answer(s): 228