Adam has 240 red stickers and blue stickers.
90% of them are red stickers and the rest are blue stickers.
When Adam gives away some red stickers,
40% of the remaining stickers are red stickers.
How many stickers does Adam give away?
|
Red |
Blue |
Before |
9 x 3 = 27 u |
1 x 3 = 3 u |
Change |
- ? |
No change |
After |
2 x 1 = 2 u |
3 x 1 = 3 u |
90% =
90100 =
91040% =
40100 =
25 The number of blue stickers remains unchanged.
Make the number of blue stickers the same using the LCM of 1 and 3.
LCM of 1 and 3 = 3
Total number of stickers at first
= 27 u + 3 u
= 30 u
30 u = 240
1 u = 240 ÷ 30 = 8
Number of stickers that Adam gives away
= 27 u - 2 u
= 25 u
= 25 x 8
= 200
Answer(s): 200