Min used ²₇ of her pink stickers and ³₇ of her yellow stickers to decorate her diary. In the end, she had an equal number of pink stickers and yellow stickers left. Given that Min had a total of 693 pink and yellow stickers at first, how many yellow stickers did she use to decorate the diary?

	Pink stickers	Yellow stickers
Before	7x4 = 28 u	7x5 = 35 u
Change	- 2x4 = - 8 u	- 3x5 = - 15 u
After	5x4 = 20 u	4x5 = 20 u

The number of pink stickers and yellow stickers in the end is the same.  Make the number of pink stickers and yellow stickers in the end the same.  LCM of 5 and 4 is 20.

Total number of stickers that Min used to decorate the diary
= 28 u + 35 u
= 63 u

63 u = 693

1 u = 693 ÷ 63 = 11

Number of yellow stickers that Min used to decorate the diary
= 15 u
= 15 x 11
= 165

Answer(s): 165