Adam has 300 red stickers and green stickers.
30% of them are red stickers and the rest are green stickers.
When Adam buys more red stickers,
80% of the stickers are red stickers.
How many stickers does Adam buy?
|
Red |
Green |
Before |
3 x 1 = 3 u |
7 x 1 = 7 u |
Change |
+ ? |
No change |
After |
4 x 7 = 28 u |
1 x 7 = 7 u |
30% =
30100 =
31080% =
80100 =
45 The number of green stickers remains unchanged.
Make the number of green stickers the same using the LCM of 7 and 1.
LCM of 7 and 1 = 7
Total number of stickers at first
= 3 u + 7 u
= 10 u
10 u = 300
1 u = 300 ÷ 10 = 30
Number of stickers that Adam buys
= 28 u - 3 u
= 25 u
= 25 x 30
= 750
Answer(s): 750