The ratio of the number of green stickers to red stickers is 5 : 3.
After Adam buys 20 green stickers and 90 red stickers,
there is an equal number of green stickers and red stickers.
How many stickers does Adam have now?
|
Green |
Red |
Before |
5 u |
3 u |
Change |
+ 20 |
+ 90 |
After |
5 u + 20 |
3 u + 90 |
The number of green stickers and red stickers are equal in the end.
5 u + 20 = 3 u + 90
5 u - 3 u = 90 - 20
2 u = 70
1 u = 70 ÷ 2 = 35
Number of stickers that Adam has now
= 5 u + 20 + 3 u + 90
= 5 u + 3 u + 20 + 90
= 8 u + 110
= 8 x 35 + 110
= 280 + 110
= 390
Answer(s): 390