The ratio of the number of blue stickers to red stickers is 3 : 1.
After Adam buys 60 blue stickers and 70 red stickers,
there is an equal number of blue stickers and red stickers.
How many stickers does Adam have now?
| |
Blue |
Red |
| Before |
3 u |
1 u |
| Change |
+ 60 |
+ 70 |
| After |
3 u + 60 |
1 u + 70 |
The number of blue stickers and red stickers are equal in the end.
3 u + 60 = 1 u + 70
3 u - 1 u = 70 - 60
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has now
= 3 u + 60 + 1 u + 70
= 3 u + 1 u + 60 + 70
= 4 u + 130
= 4 x 5 + 130
= 20 + 130
= 150
Answer(s): 150
