Adam has 180 red stickers and green stickers.
90% of them are red stickers and the rest are green stickers.
When Adam gives away some red stickers,
60% of the remaining stickers are red stickers.
How many stickers does Adam give away?
|
Red |
Green |
Before |
9 x 2 = 18 u |
1 x 2 = 2 u |
Change |
- ? |
No change |
After |
3 x 1 = 3 u |
2 x 1 = 2 u |
90% =
90100 =
91060% =
60100 =
35 The number of green stickers remains unchanged.
Make the number of green stickers the same using the LCM of 1 and 2.
LCM of 1 and 2 = 2
Total number of stickers at first
= 18 u + 2 u
= 20 u
20 u = 180
1 u = 180 ÷ 20 = 9
Number of stickers that Adam gives away
= 18 u - 3 u
= 15 u
= 15 x 9
= 135
Answer(s): 135