Erika used ⁴₇ of her brown stickers and ³₅ of her silver stickers to decorate her diary. In the end, she had an equal number of brown stickers and silver stickers left. Given that Erika had a total of 145 brown and silver stickers at first, how many silver stickers did she use to decorate the diary?

	Brown stickers	Silver stickers
Before	7x2 = 14 u	5x3 = 15 u
Change	- 4x2 = - 8 u	- 3x3 = - 9 u
After	3x2 = 6 u	2x3 = 6 u

The number of brown stickers and silver stickers in the end is the same.  Make the number of brown stickers and silver stickers in the end the same.  LCM of 3 and 2 is 6.

Total number of stickers that Erika used to decorate the diary
= 14 u + 15 u
= 29 u

29 u = 145

1 u = 145 ÷ 29 = 5

Number of silver stickers that Erika used to decorate the diary
= 9 u
= 9 x 5
= 45

Answer(s): 45