Adam has 270 red stickers and green stickers.
70% of them are red stickers and the rest are green stickers.
When Adam gives away some red stickers,
55% of the remaining stickers are red stickers.
How many stickers does Adam give away?
|
Red |
Green |
Before |
7 x 3 = 21 u |
3 x 3 = 9 u |
Change |
- ? |
No change |
After |
11 x 1 = 11 u |
9 x 1 = 9 u |
70% =
70100 =
71055% =
55100 =
1120 The number of green stickers remains unchanged.
Make the number of green stickers the same using the LCM of 3 and 9.
LCM of 3 and 9 = 9
Total number of stickers at first
= 21 u + 9 u
= 30 u
30 u = 270
1 u = 270 ÷ 30 = 9
Number of stickers that Adam gives away
= 21 u - 11 u
= 10 u
= 10 x 9
= 90
Answer(s): 90