The ratio of the number of red stickers to green stickers is 8 : 5.
After Adam buys another 90 red stickers and 90 green stickers,
the ratio of the number of red stickers to green stickers is 7 : 5.
How many stickers does Adam have now?
|
Red |
Green |
Difference |
Before |
8 x 2 = 16 u |
5 x 2 = 10 u |
3 x 2 = 6 u |
Change |
+ 90 |
+ 90 |
|
After |
7 x 3 = 21 u |
5 x 3 = 15 u |
2 x 3 = 6 u |
The difference in the number of red stickers and green stickers is the same.
Make the difference in the number of red stickers and green stickers the same using the LCM of 3 and 2.
LCM of 3 and 2 = 6
Number of red stickers that Adam buys
= 21 u - 16 u
= 5 u
5 u = 90
1 u = 90 ÷ 5 = 18
Number of stickers that Adam has now
= 21 u + 15 u
= 36 u
= 36 x 18
= 648
Answer(s): 648