Adam has 100 blue stickers and green stickers.
90% of them are blue stickers and the rest are green stickers.
When Adam gives away some blue stickers,
60% of the remaining stickers are blue stickers.
How many stickers does Adam give away?
|
Blue |
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 = 100
1 u = 100 ÷ 20 = 5
Number of stickers that Adam gives away
= 18 u - 3 u
= 15 u
= 15 x 5
= 75
Answer(s): 75