Adam has 300 blue stickers and red stickers.
55% of them are blue stickers and the rest are red stickers.
When Adam buys more blue stickers,
70% of the stickers are blue stickers.
How many stickers does Adam buy?
|
Blue |
Red |
Before |
11 x 1 = 11 u |
9 x 1 = 9 u |
Change |
+ ? |
No change |
After |
7 x 3 = 21 u |
3 x 3 = 9 u |
55% =
55100 =
112070% =
70100 =
710 The number of red stickers remains unchanged.
Make the number of red stickers the same using the LCM of 9 and 3.
LCM of 9 and 3 = 9
Total number of stickers at first
= 11 u + 9 u
= 20 u
20 u = 300
1 u = 300 ÷ 20 = 15
Number of stickers that Adam buys
= 21 u - 11 u
= 10 u
= 10 x 15
= 150
Answer(s): 150