Adam has 150 red stickers and blue stickers.
60% of them are red stickers and the rest are blue stickers.
When Adam buys more red stickers,
90% of the stickers are red stickers.
How many stickers does Adam buy?
|
Red |
Blue |
Before |
3 x 1 = 3 u |
2 x 1 = 2 u |
Change |
+ ? |
No change |
After |
9 x 2 = 18 u |
1 x 2 = 2 u |
60% =
60100 =
3590% =
90100 =
910 The number of blue stickers remains unchanged.
Make the number of blue stickers the same using the LCM of 2 and 1.
LCM of 2 and 1 = 2
Total number of stickers at first
= 3 u + 2 u
= 5 u
5 u = 150
1 u = 150 ÷ 5 = 30
Number of stickers that Adam buys
= 18 u - 3 u
= 15 u
= 15 x 30
= 450
Answer(s): 450