PSLE
At first, Zoe had an equal number of silver and blue stickers . She gave away ³₄ of her silver stickers and some blue stickers. In the end, she was left with ²₅ of her stickers. What fraction of the blue stickers did Zoe give away?

	Silver	Blue	Total
Comparing silver stickers and blue stickers at first	1x4x5 = 20 u	1x4x5 =  20 u	2x4x5 =  40 u
Before	4x5 = 20 u	20 u	5x8 = 40 u
Change	- 3x5 = - 15 u	- 9 u	- 2x8 = - 24 u
After	1x5 = 5 u	11 u	3x8 = 16 u

After1_x5 =
5 u
11 u3_x8 =
16 u
The number of silver stickers at first is repeated. Make the number of silver stickers the first the same. LCM of 4 and 1 is 4.

The total number of stickers at first is repeated. Make the total number of stickers at first the same. LCM of 8 and 5 is 40.

Number of blue stickers that Zoe was left with
= 16 u - 5 u
= 11 u

Number of blue stickers that Zoe gave away
= 20 u - 11 u
= 9 u

Fraction of the blue stickers that Zoe gave away = ⁹₂₀

Answer(s): ⁹₂₀