The ratio of the number of green stickers to red stickers is 5 : 2.
After Adam buys 20 green stickers and 50 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 |
2 u |
Change |
+ 20 |
+ 50 |
After |
5 u + 20 |
2 u + 50 |
The number of green stickers and red stickers are equal in the end.
5 u + 20 = 2 u + 50
5 u - 2 u = 50 - 20
3 u = 30
1 u = 30 ÷ 3 = 10
Number of stickers that Adam has now
= 5 u + 20 + 2 u + 50
= 5 u + 2 u + 20 + 50
= 7 u + 70
= 7 x 10 + 70
= 70 + 70
= 140
Answer(s): 140