Adam has 240 blue stickers and red stickers.
80% of them are blue stickers and the rest are red stickers.
When Adam gives away some blue stickers,
40% of the remaining stickers are blue stickers.
How many stickers does Adam give away?
|
Blue |
Red |
Before |
4 x 3 = 12 u |
1 x 3 = 3 u |
Change |
- ? |
No change |
After |
2 x 1 = 2 u |
3 x 1 = 3 u |
80% =
80100 =
4540% =
40100 =
25 The number of red stickers remains unchanged.
Make the number of red stickers the same using the LCM of 1 and 3.
LCM of 1 and 3 = 3
Total number of stickers at first
= 12 u + 3 u
= 15 u
15 u = 240
1 u = 240 ÷ 15 = 16
Number of stickers that Adam gives away
= 12 u - 2 u
= 10 u
= 10 x 16
= 160
Answer(s): 160