Adam has 240 red stickers and green stickers.
45% of them are red stickers and the rest are green stickers.
When Adam buys more red stickers,
90% of the stickers are red stickers.
How many stickers does Adam buy?
|
Red |
Green |
Before |
9 x 1 = 9 u |
11 x 1 = 11 u |
Change |
+ ? |
No change |
After |
9 x 11 = 99 u |
1 x 11 = 11 u |
45% =
45100 =
92090% =
90100 =
910 The number of green stickers remains unchanged.
Make the number of green stickers the same using the LCM of 11 and 1.
LCM of 11 and 1 = 11
Total number of stickers at first
= 9 u + 11 u
= 20 u
20 u = 240
1 u = 240 ÷ 20 = 12
Number of stickers that Adam buys
= 99 u - 9 u
= 90 u
= 90 x 12
= 1080
Answer(s): 1080