The ratio of the number of blue stickers to red stickers is 3 : 1.
After Adam buys another 25 blue stickers and 25 red stickers,
the ratio of the number of blue stickers to red stickers is 4 : 3.
How many stickers does Adam have now?
|
Blue |
Red |
Difference |
Before |
3 x 1 = 3 u |
1 x 1 = 1 u |
2 x 1 = 2 u |
Change |
+ 25 |
+ 25 |
|
After |
4 x 2 = 8 u |
3 x 2 = 6 u |
1 x 2 = 2 u |
The difference in the number of blue stickers and red stickers is the same.
Make the difference in the number of blue stickers and red stickers the same using the LCM of 2 and 1.
LCM of 2 and 1 = 2
Number of blue stickers that Adam buys
= 8 u - 3 u
= 5 u
5 u = 25
1 u = 25 ÷ 5 = 5
Number of stickers that Adam has now
= 8 u + 6 u
= 14 u
= 14 x 5
= 70
Answer(s): 70