The ratio of the number of blue stickers to red stickers is 5 : 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 |
5 u |
2 u |
Change |
+ 30 |
+ 90 |
After |
5 u + 30 |
2 u + 90 |
The number of blue stickers and red stickers are equal in the end.
5 u + 30 = 2 u + 90
5 u - 2 u = 90 - 30
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Adam has now
= 5 u + 30 + 2 u + 90
= 5 u + 2 u + 30 + 90
= 7 u + 120
= 7 x 20 + 120
= 140 + 120
= 260
Answer(s): 260