Sabrina used ²₃ of her black stickers and ³₅ of her silver stickers to decorate her diary. In the end, she had an equal number of black stickers and silver stickers left. Given that Sabrina had a total of 55 black and silver stickers at first, how many silver stickers did she use to decorate the diary?

	Black stickers	Silver stickers
Before	3x2 = 6 u	5x1 = 5 u
Change	- 2x2 = - 4 u	- 3x1 = - 3 u
After	1x2 = 2 u	2x1 = 2 u

The number of black stickers and silver stickers in the end is the same.  Make the number of black stickers and silver stickers in the end the same.  LCM of 1 and 2 is 2.

Total number of stickers that Sabrina used to decorate the diary
= 6 u + 5 u
= 11 u

11 u = 55

1 u = 55 ÷ 11 = 5

Number of silver stickers that Sabrina used to decorate the diary
= 3 u
= 3 x 5
= 15

Answer(s): 15