Adam has 280 blue stickers and red stickers.
35% of them are blue stickers and the rest are red stickers.
When Adam buys more blue stickers,
75% of the stickers are blue stickers.
How many stickers does Adam buy?
|
Blue |
Red |
Before |
7 x 1 = 7 u |
13 x 1 = 13 u |
Change |
+ ? |
No change |
After |
3 x 13 = 39 u |
1 x 13 = 13 u |
35% =
35100 =
72075% =
75100 =
34 The number of red stickers remains unchanged.
Make the number of red 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 = 280
1 u = 280 ÷ 20 = 14
Number of stickers that Adam buys
= 39 u - 7 u
= 32 u
= 32 x 14
= 448
Answer(s): 448