Linda used ⁵₇ of her purple stickers and ²₇ of her green stickers to decorate her diary. In the end, she had an equal number of purple stickers and green stickers left. Given that Linda had a total of 147 purple and green stickers at first, how many green stickers did she use to decorate the diary?

	Purple stickers	Green stickers
Before	7x5 = 35 u	7x2 = 14 u
Change	- 5x5 = - 25 u	- 2x2 = - 4 u
After	2x5 = 10 u	5x2 = 10 u

The number of purple stickers and green stickers in the end is the same.  Make the number of purple stickers and green stickers in the end the same.  LCM of 2 and 5 is 10.

Total number of stickers that Linda used to decorate the diary
= 35 u + 14 u
= 49 u

49 u = 147

1 u = 147 ÷ 49 = 3

Number of green stickers that Linda used to decorate the diary
= 4 u
= 4 x 3
= 12

Answer(s): 12