Adam has 280 blue stickers and green stickers.
70% of them are blue stickers and the rest are green stickers.
When Adam gives away some blue stickers,
30% of the remaining stickers are blue stickers.
How many stickers does Adam give away?
|
Blue |
Green |
Before |
7 x 7 = 49 u |
3 x 7 = 21 u |
Change |
- ? |
No change |
After |
3 x 3 = 9 u |
7 x 3 = 21 u |
70% =
70100 =
71030% =
30100 =
310 The number of green stickers remains unchanged.
Make the number of green stickers the same using the LCM of 3 and 7.
LCM of 3 and 7 = 21
Total number of stickers at first
= 49 u + 21 u
= 70 u
70 u = 280
1 u = 280 ÷ 70 = 4
Number of stickers that Adam gives away
= 49 u - 9 u
= 40 u
= 40 x 4
= 160
Answer(s): 160