Adam has 210 green stickers and red stickers.
80% of them are green stickers and the rest are red stickers.
When Adam gives away some green stickers,
30% of the remaining stickers are green stickers.
How many stickers does Adam give away?
|
Green |
Red |
Before |
4 x 7 = 28 u |
1 x 7 = 7 u |
Change |
- ? |
No change |
After |
3 x 1 = 3 u |
7 x 1 = 7 u |
80% =
80100 =
4530% =
30100 =
310 The number of red stickers remains unchanged.
Make the number of red stickers the same using the LCM of 1 and 7.
LCM of 1 and 7 = 7
Total number of stickers at first
= 28 u + 7 u
= 35 u
35 u = 210
1 u = 210 ÷ 35 = 6
Number of stickers that Adam gives away
= 28 u - 3 u
= 25 u
= 25 x 6
= 150
Answer(s): 150