Adam has 180 red stickers and green stickers.
30% of them are red stickers and the rest are green stickers.
When Adam buys more red stickers,
85% of the stickers are red stickers.
How many stickers does Adam buy?
|
Red |
Green |
Before |
3 x 3 = 9 u |
7 x 3 = 21 u |
Change |
+ ? |
No change |
After |
17 x 7 = 119 u |
3 x 7 = 21 u |
30% =
30100 =
31085% =
85100 =
1720 The number of green stickers remains unchanged.
Make the number of green stickers the same using the LCM of 7 and 3.
LCM of 7 and 3 = 21
Total number of stickers at first
= 9 u + 21 u
= 30 u
30 u = 180
1 u = 180 ÷ 30 = 6
Number of stickers that Adam buys
= 119 u - 9 u
= 110 u
= 110 x 6
= 660
Answer(s): 660