Mary used ⁴₇ of her pink stickers and ²₇ of her silver stickers to decorate her diary. In the end, she had an equal number of pink stickers and silver stickers left. Given that Mary had a total of 224 pink and silver stickers at first, how many silver stickers did she use to decorate the diary?

	Pink stickers	Silver stickers
Before	7x5 = 35 u	7x3 = 21 u
Change	- 4x5 = - 20 u	- 2x3 = - 6 u
After	3x5 = 15 u	5x3 = 15 u

The number of pink stickers and silver stickers in the end is the same.  Make the number of pink stickers and silver stickers in the end the same.  LCM of 3 and 5 is 15.

Total number of stickers that Mary used to decorate the diary
= 35 u + 21 u
= 56 u

56 u = 224

1 u = 224 ÷ 56 = 4

Number of silver stickers that Mary used to decorate the diary
= 6 u
= 6 x 4
= 24

Answer(s): 24