Adam has 220 red stickers and blue stickers.
55% of them are red stickers and the rest are blue stickers.
When Adam buys more red stickers,
75% of the stickers are red stickers.
How many stickers does Adam buy?
|
Red |
Blue |
Before |
11 x 1 = 11 u |
9 x 1 = 9 u |
Change |
+ ? |
No change |
After |
3 x 9 = 27 u |
1 x 9 = 9 u |
55% =
55100 =
112075% =
75100 =
34 The number of blue stickers remains unchanged.
Make the number of blue stickers the same using the LCM of 9 and 1.
LCM of 9 and 1 = 9
Total number of stickers at first
= 11 u + 9 u
= 20 u
20 u = 220
1 u = 220 ÷ 20 = 11
Number of stickers that Adam buys
= 27 u - 11 u
= 16 u
= 16 x 11
= 176
Answer(s): 176