Adam has 100 red stickers and blue stickers.
35% of them are red stickers and the rest are blue stickers.
When Adam buys more red stickers,
80% of the stickers are red stickers.
How many stickers does Adam buy?
|
Red |
Blue |
Before |
7 x 1 = 7 u |
13 x 1 = 13 u |
Change |
+ ? |
No change |
After |
4 x 13 = 52 u |
1 x 13 = 13 u |
35% =
35100 =
72080% =
80100 =
45 The number of blue stickers remains unchanged.
Make the number of blue stickers the same using the LCM of 13 and 1.
LCM of 13 and 1 = 13
Total number of stickers at first
= 7 u + 13 u
= 20 u
20 u = 100
1 u = 100 ÷ 20 = 5
Number of stickers that Adam buys
= 52 u - 7 u
= 45 u
= 45 x 5
= 225
Answer(s): 225