The ratio of the number of green stickers to red stickers is 8 : 1.
After Adam buys another 30 green stickers and 30 red stickers,
the ratio of the number of green stickers to red stickers is 6 : 1.
How many stickers does Adam have now?
|
Green |
Red |
Difference |
Before |
8 x 5 = 40 u |
1 x 5 = 5 u |
7 x 5 = 35 u |
Change |
+ 30 |
+ 30 |
|
After |
6 x 7 = 42 u |
1 x 7 = 7 u |
5 x 7 = 35 u |
The difference in the number of green stickers and red stickers is the same.
Make the difference in the number of green stickers and red stickers the same using the LCM of 7 and 5.
LCM of 7 and 5 = 35
Number of green stickers that Adam buys
= 42 u - 40 u
= 2 u
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Adam has now
= 42 u + 7 u
= 49 u
= 49 x 15
= 735
Answer(s): 735