Winnie used ³₇ of her yellow stickers and ²₅ of her blue stickers to decorate her diary. In the end, she had an equal number of yellow stickers and blue stickers left. Given that Winnie had a total of 123 yellow and blue stickers at first, how many blue stickers did she use to decorate the diary?

	Yellow stickers	Blue stickers
Before	7x3 = 21 u	5x4 = 20 u
Change	- 3x3 = - 9 u	- 2x4 = - 8 u
After	4x3 = 12 u	3x4 = 12 u

The number of yellow stickers and blue stickers in the end is the same.  Make the number of yellow stickers and blue stickers in the end the same.  LCM of 4 and 3 is 12.

Total number of stickers that Winnie used to decorate the diary
= 21 u + 20 u
= 41 u

41 u = 123

1 u = 123 ÷ 41 = 3

Number of blue stickers that Winnie used to decorate the diary
= 8 u
= 8 x 3
= 24

Answer(s): 24