Adam has 220 red stickers and blue stickers.
90% of them are red stickers and the rest are blue stickers.
When Adam gives away some red stickers,
45% of the remaining stickers are red stickers.
How many stickers does Adam give away?
|
Red |
Blue |
Before |
9 x 11 = 99 u |
1 x 11 = 11 u |
Change |
- ? |
No change |
After |
9 x 1 = 9 u |
11 x 1 = 11 u |
90% =
90100 =
91045% =
45100 =
920 The number of blue stickers remains unchanged.
Make the number of blue stickers the same using the LCM of 1 and 11.
LCM of 1 and 11 = 11
Total number of stickers at first
= 99 u + 11 u
= 110 u
110 u = 220
1 u = 220 ÷ 110 = 2
Number of stickers that Adam gives away
= 99 u - 9 u
= 90 u
= 90 x 2
= 180
Answer(s): 180