Raeann used ³₇ of her black stickers and ²₇ of her white stickers to decorate her diary. In the end, she had an equal number of black stickers and white stickers left. Given that Raeann had a total of 630 black and white stickers at first, how many white stickers did she use to decorate the diary?

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

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

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

63 u = 630

1 u = 630 ÷ 63 = 10

Number of white stickers that Raeann used to decorate the diary
= 8 u
= 8 x 10
= 80

Answer(s): 80