Adam has 110 red stickers and blue stickers.
30% 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 |
3 x 1 = 3 u |
7 x 1 = 7 u |
Change |
+ ? |
No change |
After |
3 x 7 = 21 u |
1 x 7 = 7 u |
30% =
30100 =
31075% =
75100 =
34 The number of blue stickers remains unchanged.
Make the number of blue stickers the same using the LCM of 7 and 1.
LCM of 7 and 1 = 7
Total number of stickers at first
= 3 u + 7 u
= 10 u
10 u = 110
1 u = 110 ÷ 10 = 11
Number of stickers that Adam buys
= 21 u - 3 u
= 18 u
= 18 x 11
= 198
Answer(s): 198