Adam has 180 blue stickers and red stickers.
90% of them are blue stickers and the rest are red stickers.
When Adam gives away some blue stickers,
55% of the remaining stickers are blue stickers.
How many stickers does Adam give away?
|
Blue |
Red |
Before |
9 x 9 = 81 u |
1 x 9 = 9 u |
Change |
- ? |
No change |
After |
11 x 1 = 11 u |
9 x 1 = 9 u |
90% =
90100 =
91055% =
55100 =
1120 The number of red stickers remains unchanged.
Make the number of red stickers the same using the LCM of 1 and 9.
LCM of 1 and 9 = 9
Total number of stickers at first
= 81 u + 9 u
= 90 u
90 u = 180
1 u = 180 ÷ 90 = 2
Number of stickers that Adam gives away
= 81 u - 11 u
= 70 u
= 70 x 2
= 140
Answer(s): 140