Adam has 280 red stickers and green stickers.
85% of them are red stickers and the rest are green stickers.
When Adam gives away some red stickers,
30% of the remaining stickers are red stickers.
How many stickers does Adam give away?
|
Red |
Green |
Before |
17 x 7 = 119 u |
3 x 7 = 21 u |
Change |
- ? |
No change |
After |
3 x 3 = 9 u |
7 x 3 = 21 u |
85% =
85100 =
172030% =
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
= 119 u + 21 u
= 140 u
140 u = 280
1 u = 280 ÷ 140 = 2
Number of stickers that Adam gives away
= 119 u - 9 u
= 110 u
= 110 x 2
= 220
Answer(s): 220