Adam has 170 green stickers and red stickers.
30% of them are green stickers and the rest are red stickers.
When Adam buys more green stickers,
80% of the stickers are green stickers.
How many stickers does Adam buy?
|
Green |
Red |
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 red stickers remains unchanged.
Make the number of red 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 = 170
1 u = 170 ÷ 10 = 17
Number of stickers that Adam buys
= 28 u - 3 u
= 25 u
= 25 x 17
= 425
Answer(s): 425