The ratio of the number of green stickers to red stickers is 7 : 3.
After Adam buys 30 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 |
7 u |
3 u |
| Change |
+ 30 |
+ 50 |
| After |
7 u + 30 |
3 u + 50 |
The number of green stickers and red stickers are equal in the end.
7 u + 30 = 3 u + 50
7 u - 3 u = 50 - 30
4 u = 20
1 u = 20 ÷ 4 = 5
Number of stickers that Adam has now
= 7 u + 30 + 3 u + 50
= 7 u + 3 u + 30 + 50
= 10 u + 80
= 10 x 5 + 80
= 50 + 80
= 130
Answer(s): 130
